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Document and Entity Information	12 Months Ended
Document and Entity Information	Sep. 30, 2013 shares
Document And Entity Information [Abstract]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Trading Symbol	DOX
Entity Registrant Name	AMDOCS LTD
Entity Central Index Key	0001062579
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	160,061,975

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 1,014,192	$ 879,158
Short-term interest-bearing investments	312,188	239,019
Accounts receivable, net	678,219	687,223
Deferred income taxes and taxes receivable	125,880	109,282
Prepaid expenses and other current assets	151,595	126,388
Total current assets	2,282,074	2,041,070
Equipment and leasehold improvements, net	275,544	277,907
Deferred income taxes	113,966	127,266
Goodwill	1,818,334	1,741,786
Intangible assets, net	156,726	141,278
Other noncurrent assets	279,169	315,916
Total assets	4,925,813	4,645,223
Current liabilities:
Accounts payable	132,709	167,630
Accrued expenses and other current liabilities	322,539	306,892
Accrued personnel costs	228,520	216,301
Short-term financing arrangements	200,000	200,000
Deferred revenue	151,112	145,184
Deferred income taxes and taxes payable	39,376	29,551
Total current liabilities	1,074,256	1,065,558
Deferred income taxes and taxes payable	315,965	301,795
Other noncurrent liabilities	260,809	244,668
Total liabilities	1,651,030	1,612,021
Shareholders' equity:
Preferred Shares - Authorized 25,000 shares; £0.01 par value; 0 shares issued and outstanding
Ordinary Shares - Authorized 700,000 shares; £0.01 par value; 259,668 and 251,690 issued and 160,062 and 162,454 outstanding, in 2013 and 2012, respectively	4,199	4,077
Additional paid-in capital	2,878,898	2,625,250
Treasury stock, at cost - 99,606 and 89,236 ordinary shares in 2013 and 2012, respectively	(2,785,071)	(2,418,010)
Accumulated other comprehensive income (loss)	632	(25,501)
Retained earnings	3,176,125	2,847,386
Total shareholders' equity	3,274,783	3,033,202
Total liabilities and shareholders' equity	$ 4,925,813	$ 4,645,223

CONSOLIDATED BALANCE SHEETS (Parenthetical) - £ / shares shares in Thousands	Sep. 30, 2013	Sep. 30, 2012
Statement Of Financial Position [Abstract]
Preferred Shares, authorized	25,000	25,000
Preferred Shares, par value	£ 0.01	£ 0.01
Preferred Shares, issued	0	0
Preferred Shares, outstanding	0	0
Ordinary Shares, authorized	700,000	700,000
Ordinary Shares, par value	£ 0.01	£ 0.01
Ordinary Shares, issued	259,668	251,690
Ordinary Shares, outstanding	160,062	162,454
Treasury stock, at cost, ordinary shares	99,606	89,236

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Revenue:
License	$ 81,613	$ 120,443	$ 119,237
Service	3,264,241	3,126,460	3,058,491
License and Services Revenue	3,345,854	3,246,903	3,177,728
Operating expenses:
Cost of license	2,602	3,523	2,627
Cost of service	2,164,450	2,081,945	2,066,740
Research and development	240,266	242,063	221,886
Selling, general and administrative	418,574	424,671	409,465
Amortization of purchased intangible assets and other	38,410	52,229	72,646
Total operating expenses	2,864,302	2,804,431	2,773,364
Operating income	481,552	442,472	404,364
Interest and other expense, net	6,075	948	8,657
Income before income taxes	475,477	441,524	395,707
Income taxes	63,038	50,153	49,042
Net income	$ 412,439	$ 391,371	$ 346,665
Basic earnings per share	$ 2.56	$ 2.33	$ 1.87
Diluted earnings per share	$ 2.53	$ 2.31	$ 1.86
Basic weighted average number of shares outstanding	161,330	168,275	185,213
Diluted weighted average number of shares outstanding	163,118	169,437	186,559
Cash dividends declared per ordinary share	$ 0.52	$ 0.13

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands

12 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Statement Of Income And Comprehensive Income [Abstract]

Net income

$ 412,439

$ 391,371

$ 346,665

Other comprehensive income (loss), net of tax:

Unrealized gains (losses) on foreign currency hedging contracts

^[1]

22,638

(3,505)

(20,439)

Unrealized gains (losses) on short-term interest-bearing investments

^[2]

190

2,077

(756)

Unrealized gains (losses) on defined benefit plan

^[3]

3,305

(4,417)

(413)

Other comprehensive income (loss), net of tax

26,133

(5,845)

(21,608)

Comprehensive income

$ 438,572

$ 385,526

$ 325,057

[1]	Net of tax (expense) benefit of $(7,413), $2,489 and $1,589 for the fiscal years ended September 30, 2013, 2012 and 2011, respectively
[2]	Net of tax (expense) benefit of $(49), $(40) and $24 for the fiscal years ended September 30, 2013, 2012 and 2011, respectively.
[3]	Net of tax (expense) benefit of $(1,196), $1,598 and $145 for the fiscal years ended September 30, 2013, 2012 and 2011, respectively.

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Statement Of Income And Comprehensive Income [Abstract]
Tax (expense) benefit on unrealized gains (losses) on foreign currency hedging contracts	$ (7,413)	$ 2,489	$ 1,589
Tax (expense) benefit on unrealized gains (losses) on short-term interest-bearing investments	(49)	(40)	24
Tax (expense) benefit on unrealized gains (losses) on defined benefit plan	$ (1,196)	$ 1,598	$ 145

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Ordinary Shares	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance at Sep. 30, 2010	$ 3,229,380	$ 3,956	$ 2,402,163	$ (1,309,161)	$ 1,952	$ 2,130,470
Beginning balance, Shares at Sep. 30, 2010		193,049
Comprehensive income:
Net income	346,665					346,665
Other comprehensive income (loss)	(21,608)				(21,608)
Comprehensive income	325,057
Employee stock options exercised	56,459	$ 42	56,417
Employee stock options exercised, Shares		2,590
Repurchase of shares	(624,241)			(624,241)
Repurchase of shares, Shares		(21,866)
Issuance of restricted stock, net of forfeitures	15	$ 15
Issuance of restricted stock, net of forfeitures, Shares		919
Equity-based compensation expense related to employees	36,631		36,631
Ending balance at Sep. 30, 2011	3,023,301	$ 4,013	2,495,211	(1,933,402)	(19,656)	2,477,135
Ending balance, Shares at Sep. 30, 2011		174,692
Comprehensive income:
Net income	391,371					391,371
Other comprehensive income (loss)	(5,845)				(5,845)
Comprehensive income	385,526
Employee stock options exercised	86,666	$ 56	86,610
Employee stock options exercised, Shares		3,585
Repurchase of shares	(484,608)			(484,608)
Repurchase of shares, Shares		(16,288)
Cash dividends declared	(21,120)					(21,120)
Issuance of restricted stock, net of forfeitures	8	$ 8
Issuance of restricted stock, net of forfeitures, Shares		465
Equity-based compensation expense related to employees	43,429		43,429
Ending balance at Sep. 30, 2012	$ 3,033,202	$ 4,077	2,625,250	(2,418,010)	(25,501)	2,847,386
Ending balance, Shares at Sep. 30, 2012	162,454	162,454
Comprehensive income:
Net income	$ 412,439					412,439
Other comprehensive income (loss)	26,133				26,133
Comprehensive income	438,572
Employee stock options exercised	$ 213,420	$ 112	213,308
Employee stock options exercised, Shares	7,243	7,243
Repurchase of shares	$ (367,061)			(367,061)
Repurchase of shares, Shares	(10,370)	(10,370)
Cash dividends declared	$ (83,700)					(83,700)
Issuance of restricted stock, net of forfeitures	10	$ 10
Issuance of restricted stock, net of forfeitures, Shares		735
Equity-based compensation expense related to employees	40,340		40,340
Ending balance at Sep. 30, 2013	$ 3,274,783	$ 4,199	$ 2,878,898	$ (2,785,071)	$ 632	$ 3,176,125
Ending balance, Shares at Sep. 30, 2013	160,062	160,062

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per ordinary share	$ 0.52	$ 0.13
Unrealized gain (loss) on derivatives, net of tax	$ 4,696	$ (17,942)	$ (14,437)
Unrealized gain (loss) on short-term interest-bearing investments, net of tax	244	54	(2,023)
Unrealized (loss) on defined benefit plan, net of tax	$ (4,308)	$ (7,613)	$ (3,196)

- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References + Details

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Cash Flow from Operating Activities:
Net income	$ 412,439	$ 391,371	$ 346,665
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	140,776	159,614	181,477
Equity-based compensation expense	40,340	43,429	36,631
Deferred income taxes	12,485	(4,857)	1,252
Excess tax benefit from equity-based compensation	(366)	(181)	(178)
Gain on sale of investments		(9,172)
Loss from short-term interest-bearing investments	2,269	3,041	1,386
Net changes in operating assets and liabilities, net of amounts acquired:
Accounts receivable, net	29,999	(106,551)	38,062
Prepaid expenses and other current assets	(86)	1,601	(10,741)
Other noncurrent assets	29,384	19,734	(15,807)
Accounts payable, accrued expenses and accrued personnel	(4,104)	60,200	(46,976)
Deferred revenue	(15,078)	(55,811)	(34,444)
Income taxes payable, net	(5,268)	14,305	27,289
Other noncurrent liabilities	27,757	(2,654)	10,876
Net cash provided by operating activities	670,547	514,069	535,492
Cash Flow from Investing Activities:
Payments for purchase of equipment and leasehold improvements, net	(106,724)	(122,053)	(109,779)
Proceeds from sale of short-term interest-bearing investments	311,677	440,145	591,147
Purchase of short-term interest-bearing investments	(386,876)	(337,989)	(521,999)
Net cash paid for acquisitions	(112,405)		(162,964)
Cash received from sale of investments		11,172
Other	(2,801)	(8,564)	(18,076)
Net cash used in investing activities	(297,129)	(17,289)	(221,671)
Cash Flow from Financing Activities:
Borrowings under financing arrangements	200,000	200,000	250,000
Payments under financing arrangements	(200,000)	(250,000)	(200,000)
Repurchase of shares	(367,061)	(484,608)	(624,241)
Proceeds from employee stock options exercised	213,430	86,674	56,474
Payments of dividends	(84,008)
Payments under capital lease, short-term financing arrangements and other	(745)	(1,059)	(878)
Net cash used in financing activities	(238,384)	(448,993)	(518,645)
Net increase (decrease) in cash and cash equivalents	135,034	47,787	(204,824)
Cash and cash equivalents at beginning of year	879,158	831,371	1,036,195
Cash and cash equivalents at end of year	1,014,192	879,158	831,371
Cash paid for:
Income taxes, net of refunds	38,441	36,909	19,611
Interest	$ 468	$ 408	$ 433

Nature of Entity	12 Months Ended
Nature of Entity	Sep. 30, 2013
Accounting Policies [Abstract]
Nature of Entity	Note 1 — Nature of Entity Amdocs Limited (the “Company”) is a leading provider of software and services for communications, media and entertainment industry service providers. The Company and its subsidiaries operate in one segment, providing integrated products and services. The Company designs, develops, markets, supports, implements and operates customer experience systems primarily for leading wireless, wireline, cable and satellite service providers throughout the world. Amdocs also offers a full range of advertising and media solutions for local marketing service providers and search and directory publishers. The Company is a Guernsey corporation, which directly or indirectly holds numerous wholly-owned subsidiaries around the world. The majority of the Company’s customers are in North America, Europe, Latin America and the Asia-Pacific region. The Company’s main development facilities are located in Brazil, Canada, Cyprus, India, Ireland, Israel and the United States.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph 8, C1, C7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2013
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2 — Summary of Significant Accounting Policies *Basis of Presentation* The consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles, or U.S. GAAP. *Consolidation* The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. *Use of Estimates* The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. *Reclassifications* From time to time, certain immaterial amounts in prior years’ financial statements may be reclassified to conform to the current year’s presentation. *Functional Currency* The Company manages its foreign subsidiaries as integral direct components of its operations. The operations of the Company’s foreign subsidiaries provide the same type of services with the same type of expenditures throughout the Amdocs group. The Company has determined that its functional currency is the U.S. dollar. The Company periodically assesses the applicability of the U.S. dollar as the Company’s functional currency by reviewing the salient indicators as indicated in the authoritative guidance for foreign currency matters. *Cash and Cash Equivalents* Cash and cash equivalents consist of cash and interest-bearing investments with insignificant interest rate risk and maturities from acquisition date of 90 days or less. *Investments* The Company classifies all of its short-term interest-bearing investments as available-for-sale securities. Such short-term interest-bearing investments consist primarily of money market funds, U.S. government treasuries, corporate bonds and U.S. agency securities, which are stated at market value. Unrealized gains and losses are comprised of the difference between market value and amortized costs of such securities and are reflected, net of tax, as “accumulated other comprehensive income (loss)” in shareholders’ equity, unless a security is other than temporarily impaired. The Company recognizes an impairment charge in earnings when a decline in the fair value of its investments below the cost basis is judged to be other-than-temporary. For securities with an unrealized loss that the Company intends to sell, or it is more likely than not that the Company will be required to sell before recovery of their amortized cost basis, the entire difference between amortized cost and fair value is recognized in earnings. For securities that do not meet these criteria, the amount of impairment recognized in earnings is limited to the amount related to credit losses, while other declines in fair value related to other factors are recognized in other comprehensive income (loss). The Company uses a discounted cash flow analysis to determine the portion of the impairment that relates to the credit losses. To the extent that the net present value of the projected cash flows is less than the amortized cost of the security, the difference is considered credit loss. Realized gains and losses on short-term interest-bearing investments are included in earnings and are derived using the first in first out (FIFO) method for determining the cost of securities. *Equipment and Leasehold Improvements* Equipment and leasehold improvements are stated at cost. Assets under capital leases are recorded at the present value of the future minimum lease payments at the date of acquisition. Depreciation is computed using the straight-line method over the estimated useful life of the asset, which primarily ranges from three to ten years and includes the amortization of assets under capitalized leases. Leasehold improvements are amortized over the shorter of the estimated useful lives or the term of the related lease. The Company capitalizes certain expenditures for software that is internally developed for use in the business, which is classified as computer equipment. Amortization of internal use software begins when the software is ready for service and continues on the straight-line method over the estimated useful life. *Goodwill, Intangible Assets and Long-Lived Assets* Goodwill and intangible assets deemed to have indefinite lives are subject to an annual impairment test or more frequently if impairment indicators are present. Goodwill impairment is deemed to exist if the net book value of a reporting unit exceeds its estimated fair value. The goodwill impairment test involves a two-step process. The first step, identifying a potential impairment, compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying value of the reporting unit exceeds its fair value, the second step would need to be conducted; otherwise, no further steps are necessary as no potential impairment exists. The second step, measuring the impairment loss, compares the implied fair value of the reporting unit goodwill with the carrying amount of that goodwill. Any excess of the reporting unit goodwill carrying value over the respective implied fair value is recognized as an impairment loss. The total purchase price of business acquisitions accounted for using the purchase method is allocated first to identifiable assets and liabilities based on estimated fair values. The excess of the purchase price over the fair value of net assets of purchased businesses is recorded as goodwill. Other definite-life intangible assets consist primarily of core technology, customer relationships and trademarks. Core technology and trademarks acquired by the Company are amortized over their estimated useful lives on a straight-line basis. Some of the acquired customer relationships are amortized over their estimated useful lives in proportion to the economic benefits realized. This accounting policy generally results in accelerated amortization of such customer relationships as compared to the straight-line method. All other acquired customer relationships are amortized over their estimated useful lives on a straight-line basis. The Company tests long-lived assets, including definite life intangible assets, for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Determination of recoverability of long-lived assets is based on an estimate of the undiscounted future cash flows resulting from the use of the cash generating unit and its eventual disposition. Measurement of an impairment loss for long-lived assets, including definite life intangible assets that management expects to hold and use is based on the fair value of the cash generating unit. Long-lived assets, including definite life intangible assets, to be disposed of are reported at the lower of carrying amount or fair value less costs to sell. *Comprehensive Income* Comprehensive income, net of related taxes where applicable, includes, in addition to net income: (i) unrealized gains and losses on available-for-sale securities; (ii) unrealized gains and losses in respect of derivative instruments designated as a cash flow hedge; and (iii) unrealized gains and losses on defined benefit plans. *Treasury Stock* The Company repurchases its ordinary shares from time to time on the open market or in other transactions and holds such shares as treasury stock. The Company presents the cost to repurchase treasury stock as a reduction of shareholders’ equity. *Income Taxes* The Company records deferred income taxes to reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting and tax purposes. Deferred taxes are computed based on tax rates anticipated to be in effect when the deferred taxes are expected to be paid or realized. A valuation allowance is provided for deferred tax assets if it is more likely than not, the Company will not be able to realize their benefit. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting, or according to the expected reversal dates of the specific temporary differences if not related to an asset or liability for financial reporting, and also include anticipated withholding taxes due on subsidiaries’ earnings when paid as dividends to the Company. The Company recognizes the tax benefit from an uncertain tax position only if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The tax benefits recognized in the financial statements from such a position is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. The Company will classify the liability for unrecognized tax benefits as current to the extent that the Company anticipates payment of cash within one year. Interest and penalties related to uncertain tax positions are recognized in the provision for income taxes. Please see Note 11 to the consolidated financial statements. *Revenue Recognition* Revenue is recognized only when all of the following conditions have been met: (i) there is persuasive evidence of an arrangement; (ii) delivery has occurred; (iii) the fee is fixed or determinable; and (iv) collectibility of the fee is reasonably assured. The Company usually sells its software licenses as part of an overall solution offered to a customer that combines the sale of software licenses with a broad range of services, which normally include significant customization, modification, implementation and integration. Those services are deemed essential to the software. As a result, combined license and service revenue is generally recognized over the course of these long-term projects, using the percentage of completion method of accounting. When total cost estimates for these types of arrangements exceed revenues in a fixed-price arrangement, the estimated losses are recognized immediately based upon the cost applicable to the delivering unit. Initial license fee for software revenue is recognized as work is performed, under the percentage of completion method of accounting. Subsequent license fee revenue is recognized upon completion of specified conditions in each contract, based on a customer’s subscriber level or transaction volume or other measurements when greater than the level specified in the contract for the initial license fee. Service revenue that involves significant ongoing obligations, including fees for software customization, modification, implementation and integration as part of a long-term contract, is recognized as work is performed, under the percentage of completion method of accounting. Revenue from software solutions that do not require significant customization, implementation and modification is recognized upon delivery. Service revenue that does not involve significant ongoing obligations is recognized as services are rendered. Fees are generally considered fixed and determinable unless a significant portion (more than 10%) of the license and related service fee is due more than 12 months after delivery, in which case license and related services fees are recognized when payments are due. In managed services contracts and in other long term contracts, revenue from the operation of a customer’s system is recognized either as services are performed based on time elapsed, output produced, volume of data processed or subscriber count, depending on the specific contract terms of the managed services arrangement. Typically, managed services contracts are long term in duration and are not subject to seasonality. Revenue from ongoing support services is recognized as work is performed. Revenue from third-party hardware sales is recognized upon delivery and installation, and revenue from third-party software sales is recognized upon delivery. Revenue from third-party hardware and software sales is recorded at gross amount for transactions in which the Company is the primary obligor under the arrangement as well as, in some cases, possesses other attributes such as latitude in determining prices and selecting suppliers. In specific circumstances where the Company does not meet the above criteria, particularly when the contract stipulates that the Company is not the primary obligor, the Company recognizes revenue on a net basis. Revenue from third-party sales is included in service revenue and was less than 10% of total revenue in each of fiscal 2013, 2012 and 2011. In certain arrangements, the Company may earn revenue from other third-party services which is recorded at a gross amount as the Company is the primary obligor under the arrangement. Maintenance revenue is recognized ratably over the term of the maintenance agreement, which in most cases is one year. As a result of a significant portion of the Company’s revenue being subject to the percentage of completion accounting method, the Company’s annual and quarterly operating results may be significantly affected by the size and timing of customer projects and the Company’s progress in completing such projects. Many of the Company’s agreements include multiple deliverables. The Company’s multiple element arrangements are comprised of a variety of different combinations of the deliverables mentioned above. For multiple element arrangements within the scope of software revenue recognition guidance, the Company allocates revenue to each element based upon its relative fair value as determined by Vendor Specific Objective Evidence (“VSOE”). In the absence of fair value for a delivered element the Company uses the residual method. The residual method requires that the Company first allocate revenue to the fair value of the undelivered elements and residual revenue to delivered elements. If VSOE of any undelivered items does not exist, revenue from the entire arrangement is deferred and recognized at the earlier of (i) delivery of those elements for which VSOE does not exist or (ii) when VSOE can be established. However, in limited cases where maintenance is the only undelivered element without VSOE, the entire arrangement fee is recognized ratably upon commencement of the maintenance services. The residual method is used mainly in multiple element arrangements that include license for the sale of software solutions that do not require significant customization, modification, implementation and integration and maintenance to determine the appropriate value for the license component. Under the guidance for revenue arrangements with multiple deliverables that are outside the scope of the software revenue recognition guidance, the Company allocates revenue to each element based upon the relative fair value. Fair value would be allocated by using a hierarchy of 1) VSOE, 2) third-party evidence of selling price for that element, or 3) estimated selling price, or ESP, for individual elements of an arrangement when VSOE or third-party evidence of selling price is unavailable. This results in the elimination of the residual method of allocating revenue consideration. The Company determines ESP for the purposes of allocating the consideration to individual elements of an arrangement by considering several external and internal factors including, but not limited to, pricing practices, margin objectives, geographies in which the Company offers its services and internal costs. The determination of ESP is judgmental and is made through consultation with and approval by management. In certain circumstances where the Company enters into a contract with a customer for the provision of managed services for a defined period of time, the Company defers certain direct costs incurred at the inception of the contract. These costs include time and expense incurred in association with the origination of a contract. In addition, if the revenue for a delivered item is not recognized because it is not separable from the undelivered item, then the Company also defers the cost of the delivered item. The deferred costs are amortized on a straight-line basis over the managed services period, or over the recognition period of the undelivered item. Revenue associated with these capitalized costs is deferred and is recognized over the same period. Deferred revenue represents billings to customers for licenses and services for which revenue has not been recognized. Deferred revenue that is expected to be recognized beyond the next 12 months is considered long-term deferred revenue. Unbilled accounts receivable include all revenue amounts that had not been billed as of the balance sheet date due to contractual or other arrangements with customers. Unbilled accounts receivable that are expected to be billed beyond the next 12 months are considered long-term unbilled receivables. *Cost of License and Cost of Service* Cost of license and cost of service consist of all costs associated with providing software licenses and services to customers, including identified losses on contracts. Estimated losses on contracts accounted for using the percentage of completion method of accounting are recognized in the period in which the loss is identified. Cost of license includes license fees and royalty payments to software suppliers. Cost of service also includes costs of third-party products associated with reselling third-party computer hardware and software products to customers and other third-party services, when the related revenue is recorded at the gross amount. Customers purchasing third-party products and services from the Company generally do so in conjunction with the purchase of the Company’s software and services. *Research and Development* Research and development expenditures consist of costs incurred in the development of new software modules and product offerings, either as part of the Company’s internal product development programs, which are sold, leased or otherwise marketed. Research and development costs are expensed as incurred. Based on the Company’s product development process, technological feasibility is established upon completion of a detailed program design or, in the absence thereof, completion of a working model. Costs incurred by the Company after achieving technological feasibility and before the product is ready for customer release have been insignificant. *Equity-Based Compensation* The Company measures and recognizes the compensation expense for all equity-based payments to employees and directors based on their estimated fair values. The Company estimates the fair value of employee stock options at the date of grant using a Black-Scholes valuation model and values restricted stock based on the market value of the underlying shares at the date of grant. The Company recognizes compensation costs using the graded vesting attribution method that results in an accelerated recognition of compensation costs in comparison to the straight-line method. The Company uses a combination of implied volatility of the Company’s traded options and historical stock price volatility (“blended volatility”) as the expected volatility assumption required in the Black-Scholes option valuation model. As equity-based compensation expense recognized in the Company’s consolidated statements of income is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. *Concentrations of Credit Risk* Financial instruments that potentially subject the Company to concentration of credit risk consist principally of cash and cash equivalents, short-term interest-bearing investments, and trade receivables. Cash and cash equivalents are maintained with several financial institutions. Generally, these deposits may be redeemed upon demand and are maintained with financial institutions with reputable credit and therefore bear minimal credit risk. The Company seeks to mitigate its credit risks by spreading such risks across multiple financial institutions and monitoring the risk profiles of these counterparties. The Company has conservative investment policy guidelines under which it invests its excess cash primarily in highly liquid U.S. dollar-denominated securities. The Company’s revenue is generated primarily in North America. To a lesser extent, revenue is generated in Europe, the Asia-Pacific region and Latin America. Most of the Company’s customers are among the largest communications and directory publishing companies in the world (or are owned by them). The Company’s business is subject to the effects of general global economic conditions and market conditions in the communications industry. The Company performs ongoing credit analyses of its customer base and generally does not require collateral. The Company evaluates accounts receivable to determine if they will ultimately be collected. Significant judgments and estimates are involved in performing this evaluation, which are based on factors that may affect a customer’s ability to pay, such as past experience, credit quality of the customer, age of the receivable balance and current economic conditions. The allowance for doubtful accounts is for estimated losses resulting from accounts receivable for which their collection is not reasonably probable. As of September 30, 2013, the Company had one customer with an account receivable balance of more than 10% of total accounts receivable, amounting to 25%, which was lower than its respective portion of total revenue. As of September 30, 2012, the Company had two customers with accounts receivable balances of 10% or more of total accounts receivable, aggregating 28%, which was lower than their aggregate portion of total revenue. *Earnings per Share* Basic earnings per share is calculated using the weighted average number of shares outstanding during the period. Diluted earnings per share is computed on the basis of the weighted average number of shares outstanding, the effect of dilutive outstanding equity-based awards using the treasury stock method and the effect of dilutive outstanding convertible notes using the if-converted method. *Derivatives and Hedging* The Company carries out transactions involving foreign currency exchange derivative financial instruments. The transactions are designed to hedge the Company’s exposure in currencies other than the U.S. dollar. The Company recognizes derivative instruments as either assets or liabilities and measures those instruments at fair value. If a derivative meets the definition of a cash flow hedge and is so designated, changes in the fair value of the derivative are recognized in other comprehensive income (loss) until the hedged item is recognized in earnings. The ineffective portion of a derivative designated as a cash flow hedge is recognized in earnings. If a derivative does not meet the definition of a cash flow hedge, the changes in the fair value are included in earnings. *Recent Accounting Standards* In July 2013, the Financial Accounting Standards Board, or FASB, issued an accounting standard update, under which an entity must present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, in the absence of certain conditions. This accounting standard update will be effective for the Company on October 1, 2014, and may result in changes in the Company’s financial statements presentation but will not affect the substantive content of the Company’s consolidated financial statements. In February 2013, the FASB issued an accounting standard update to require reclassification adjustments from other comprehensive income to be presented either in the financial statements or in the notes to the financial statements. This accounting standard update became effective for the Company in the first quarter of fiscal 2014 and will result in additional disclosures in the Company’s financial statements but will not affect the substantive content of the Company’s consolidated financial statements. *Adoption of New Accounting Standards* In September 2011, the FASB issued a revised accounting standard update intended to simplify how an entity tests goodwill for impairment. The amendment allows an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity no longer is required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. This accounting standard update became effective for the Company in the first quarter of fiscal 2013, and its adoption did not have any impact on the result of the Company’s annual goodwill impairment test or its consolidated financial statements. In June 2011, the FASB issued guidance to require an entity to present the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements, thus eliminating the option to present the components of other comprehensive income as part of the statement of equity. The Company adopted this guidance in the first quarter of fiscal 2013 by including the required disclosures in two separate but consecutive statements.

Acquisitions	12 Months Ended
Acquisitions	Sep. 30, 2013
Business Combinations [Abstract]
Acquisitions	Note 3 — Acquisitions Entities acquired by the Company during the last three fiscal years have been consolidated into the Company’s results of operations since their respective acquisition dates. These acquisitions, individually and in the aggregate, were not material in any fiscal year. During fiscal 2013, the Company acquired Actix International Limited (“Actix”), a provider of software for mobile network optimization, for $112,405, net of cash. Please see Note 9 to the consolidated financial statements.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 805
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-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1490-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph F4
-Subparagraph e
-Appendix F

Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value Measurements

12 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 4 — Fair Value Measurements

The Company accounts for certain assets and liabilities at fair value. Fair value is the price that would be received from selling an asset or that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and it considers assumptions that market participants would use when pricing the asset or liability.

The hierarchy below lists three levels of fair value based on the extent to which inputs used in measuring fair value are observable in the market. The Company categorizes each of its fair value measurements in one of these three levels based on the lowest level input that is significant to the fair value measurement in its entirety.

The three levels of inputs that may be used to measure fair value are as follows:

Level 1: Quoted prices in active markets for identical assets or liabilities;

Level 2: Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets), or other inputs that are observable (model-derived valuations in which significant inputs are observable) or can be derived principally from, or corroborated by, observable market data; and

Level 3: Unobservable inputs that are supported by little or no market activity that is significant to the fair value of the assets or liabilities.

The following tables present the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2013 and 2012:


	As of September 30, 2013
	Level 1		Level 2		Total
Available-for-sale securities:
Money market funds	$	565,216	$	—	$	565,216
U.S. government treasuries		198,164		—		198,164
Corporate bonds		—		81,727		81,727
U.S. agency securities		—		25,529		25,529
Commercial paper and certificates of deposit		6,189		3,901		10,090
Government-guaranteed debt		—		6,846		6,846
Supranational and sovereign debt		—		6,311		6,311
Mortgages (including agencies and corporate)		—		879		879

Total available-for-sale securities		769,569		125,193		894,762

Derivative financial instruments, net		—		7,538		7,538

Total	$	769,569	$	132,731	$	902,300


	As of September 30, 2012
	Level 1		Level 2			Total
Available-for-sale securities:
Money market funds	$	485,012	$	—		$	485,012
U.S. government treasuries		93,387		—			93,387
Corporate bonds		—		60,923			60,923
U.S. agency securities		—		27,756			27,756
Commercial paper and certificates of deposit		6,155		1,501			7,656
Government-guaranteed debt		—		32,689			32,689
Supranational and sovereign debt		—		11,644			11,644
Mortgages (including agencies and corporate)		—		5,134			5,134
Asset backed obligations		—		3,417			3,417

Total available-for-sale securities		584,554		143,064			727,618

Derivative financial instruments, net		—		(23,928	)		(23,928	)

Total	$	584,554	$	119,136		$	703,690

Available-for-sale securities that are classified as Level 2 assets are priced using observable data that may include quoted market prices for similar instruments, market dealer quotes, market spreads, non-binding market prices that are corroborated by observable market data and other observable market information and discounted cash flow techniques. The Company’s derivative instruments are classified as Level 2 as they represent foreign currency forward and option contracts valued primarily based on observable inputs including forward rates and yield curves. The Company did not have any transfers between Level 1 and Level 2 fair value measurements during fiscal 2013 or fiscal 2012.

Fair Value of Financial Instruments

The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable, accrued personnel costs, short-term financing arrangements and other current liabilities approximate their fair value because of the relatively short maturity of these items.

- Definition

The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 33
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Available-For-Sale Securities

12 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Available-For-Sale Securities

Note 5 — Available-For-Sale Securities

Available-for-sale securities consist of the following interest-bearing investments:


	As of September 30, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market funds	$	565,216	$	—	$	—	$	565,216
U.S. government treasuries		198,031		133		—		198,164
Corporate bonds		81,599		223		95		81,727
U.S. agency securities		25,529		—		—		25,529
Commercial paper and certificates of deposit		10,090		—		—		10,090
Government-guaranteed debt		6,766		80		—		6,846
Supranational and sovereign debt		6,318		—		7		6,311
Mortgages (including agencies and corporate)		958		—		79		879

Total(1)	$	894,507	$	436	$	181	$	894,762

(1)

Available-for-sale securities with maturities longer than 90 days from the date of acquisition were classified as short term interest-bearing investments and available-for-sale securities with maturities of 90 days or less from the date of acquisition were included in cash and cash equivalents on the Company’s balance sheet. As of September 30, 2013, $312,188 of securities were classified as short term interest-bearing investments and $582,574 of securities were classified as cash and cash equivalents.


	As of September 30, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market funds	$	485,012	$	—	$	—	$	485,012
U.S. government treasuries		93,255		132		—		93,387
Corporate bonds		60,350		573		—		60,923
U.S. agency securities		27,637		119		—		27,756
Commercial paper and certificates of deposit		7,656		—		—		7,656
Government-guaranteed debt		32,484		205		—		32,689
Supranational and sovereign debt		11,628		16		—		11,644
Mortgages (including agencies and corporate)		5,780		—		646		5,134
Asset backed obligations		3,800		—		383		3,417

Total(2)	$	727,602	$	1,045	$	1,029	$	727,618

(2)	As of September 30, 2012, $239,019 of securities were classified as short term interest-bearing investments and $488,599 of securities were classified as cash and cash equivalents.

As of September 30, 2013, the unrealized losses attributable to the Company’s available-for-sale securities were primarily due to credit market conditions and interest rate movements. The Company assessed whether such unrealized losses for the investments in its portfolio were other-than-temporary. Based on this assessment, the Company recognized an immaterial credit loss in fiscal 2013, 2012 and 2011.

As of September 30, 2013, the Company’s available-for-sale securities had the following maturity dates:


	Market Value
Due within one year	$	716,893
1 to 2 years		112,012
2 to 3 years		59,467
3 to 4 years		5,314
Thereafter		1,076

	$	894,762

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Derivative Financial Instruments

12 Months Ended

Sep. 30, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 6 — Derivative Financial Instruments

The Company’s risk management strategy includes the use of derivative financial instruments to reduce the volatility of earnings and cash flows associated with changes in foreign currency exchange rates. The Company does not enter into derivative transactions for trading purposes.

The Company’s derivatives expose it to credit risks from possible non-performance by counterparties. The Company utilizes standard counterparty master netting agreements that net certain foreign currency transactions in the event of the insolvency of one of the parties to the transaction. These master netting arrangements permit the Company to net amounts due from the Company to a counterparty with amounts due to the Company from the same counterparty. The Company has elected to present the related assets and liabilities on a gross basis. Taking into account the Company’s right to net certain gains with losses, the maximum amount of loss due to credit risk that the Company would incur if all counterparties to the derivative financial instruments failed completely to perform, according to the terms of the contracts, based on the gross fair value of the Company’s derivative contracts that are favorable to the Company, was approximately $20,702 as of September 30, 2013. The Company has limited its credit risk by entering into derivative transactions exclusively with investment-grade rated financial institutions and monitors the creditworthiness of these financial institutions on an ongoing basis.

The Company classifies cash flows from its derivative transactions as cash flows from operating activities in the consolidated statements of cash flow.

The table below presents the total volume or notional amounts of the Company’s derivative instruments as of September 30, 2013. Notional values are in U.S. dollars and are translated and calculated based on forward rates as of September 30, 2013 for forward contracts, and based on spot rates as of September 30, 2013 for options.


	Notional Value*
Foreign exchange contracts	$	850,665

(*)	Gross notional amounts do not quantify risk or represent assets or liabilities of the Company, but are used in the calculation of settlements under the contracts.

The Company records all derivative instruments on the balance sheet at fair value. For further information, please see Note 4 to the consolidated financial statements. The fair value of the open foreign exchange contracts recorded by the Company on its consolidated balance sheets as of September 30, 2013 and September 30, 2012, as an asset or a liability is as follows:


	As of
	September 30,
	2013			2012
*Derivatives designated as hedging instruments*
Prepaid expenses and other current assets	$	21,595		$	855
Other noncurrent assets		3,134			1,453
Accrued expenses and other current liabilities		(11,641	)		(20,087	)
Other noncurrent liabilities		(5,567	)		(4,166	)

		7,521			(21,945	)
*Derivatives not designated as hedging instruments*
Prepaid expenses and other current assets		2,688			1,507
Accrued expenses and other current liabilities		(2,671	)		(3,490	)

		17			(1,983	)

Net fair value	$	7,538		$	(23,928	)

Cash Flow Hedges

In order to reduce the impact of changes in foreign currency exchange rates on its results, the Company enters into foreign currency exchange forward and option contracts to purchase and sell foreign currencies to hedge a significant portion of its foreign currency net exposure resulting from revenue and expense transactions denominated in currencies other than the U.S. dollar. The Company designates these contracts for accounting purposes as cash flow hedges. The Company currently hedges its exposure to the variability in future cash flows for a maximum period of two years (a significant portion of the forward and option contracts outstanding as of September 30, 2013 is expected to mature within the next 12 months).

The effective portion of the gain or loss on the derivative instruments is initially recorded as a component of other comprehensive income (loss), a separate component of shareholders’ equity, and subsequently reclassified into earnings in the same line item as the related forecasted transaction and in the same period or periods during which the hedged exposure affects earnings. The cash flow hedges are evaluated for effectiveness at least quarterly. As the critical terms of the forward contract or option and the hedged transaction are matched at inception, the hedge effectiveness is assessed generally based on changes in the fair value for cash flow hedges, as compared to the changes in the fair value of the cash flows associated with the underlying hedged transactions. Hedge ineffectiveness, if any, and hedge components, such as time value, excluded from assessment of effectiveness testing for hedges of estimated revenue from customers, are recognized immediately in interest and other expense, net.

The effect of the Company’s cash flow hedging instruments in the consolidated statements of income for the fiscal years ended September 30, 2013, 2012 and 2011, respectively, which partially offsets the foreign currency impact from the underlying exposures, is summarized as follows:


	Gains (Losses) Reclassified from Other Comprehensive Income (Loss) (Effective Portion) Year Ended September 30,
	2013			2012			2011
Line item in statements of income:
Revenue	$	(66	)	$	3,091		$	(2,410	)
Cost of service		(2,945	)		(21,504	)		11,244
Research and development		803			(2,928	)		2,477
Selling, general and administrative		661			(3,395	)		2,220

Total	$	(1,547	)	$	(24,736	)	$	13,531

The activity related to the changes in net unrealized gains (losses) on cash flow hedges recorded in accumulated other comprehensive income (loss), net of tax, is as follows:


	Year Ended September 30,
	2013			2012			2011
Net unrealized (losses) gains on cash flow hedges, net of tax, beginning of period	$	(17,942	)	$	(14,437	)	$	6,002
Changes associated with hedging transactions, net of tax		20,035			(26,108	)		(8,483	)
Reclassification of losses (gains) into earnings, net of tax		2,603			22,603			(11,956	)

Net unrealized gains (losses) on cash flow hedges, net of tax, end of period	$	4,696		$	(17,942	)	$	(14,437	)

Gains (losses) from cash flow hedges recognized in other comprehensive income (loss), net of taxes, during the fiscal years ended September 30, 2013, 2012 and 2011 were $28,504, $(30,730) and $(8,497), or $20,035, $(26,108) and $(8,483), respectively.

Of the net gains related to derivatives designated as cash flow hedges and recorded in accumulated other comprehensive income (loss) as of September 30, 2013, a net gain of $6,870 will be reclassified into earnings during fiscal 2014 and will partially offset the foreign currency impact from the underlying exposures. The amount ultimately realized in earnings will likely differ due to future changes in foreign exchange rates.

The ineffective portion of the change in fair value of a cash flow hedge, including the time value portion excluded from effectiveness testing for the fiscal years ended September 30, 2013, 2012 and 2011, was not material.

Cash flow hedges are required to be discontinued in the event it becomes probable that the underlying forecasted hedged transaction will not occur. The Company did not discontinue any cash flow hedges during any of the periods presented nor does the Company anticipate any such discontinuance in the normal course of business.

Other Risk Management Derivatives

The Company also enters into foreign currency exchange forward and option contracts that are not designated as hedging instruments under hedge accounting and are used to reduce the impact of foreign currency on certain balance sheet exposures and certain revenue and expense transactions.

These instruments are generally short-term in nature, with typical maturities of less than 12 months, and are subject to fluctuations in foreign exchange rates.

The effect of the Company’s derivative instruments not designated as hedging instruments in the consolidated statements of income for the fiscal years ended September 30, 2013, 2012 and 2011, respectively, which partially offsets the foreign currency impact from the underlying exposure, is summarized as follows:


	Gains (Losses) Recognized in Income Year Ended September 30,
	2013			2012			2011
Line item in statements of income:
Revenue	$	362		$	(302	)	$	(2,060	)
Cost of service		4,666			(1,548	)		(1,301	)
Research and development		1,136			(319	)		151
Selling, general and administrative		1,276			(518	)		(254	)
Interest and other expense, net		4,145			(1,250	)		1,713
Income taxes		(1,179	)		506			(311	)

Total	$	10,406		$	(3,431	)	$	(2,062	)

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Accounts Receivable, Net

12 Months Ended

Sep. 30, 2013

Text Block [Abstract]

Accounts Receivable, Net

Note 7 — Accounts Receivable, Net

Accounts receivable, net consists of the following:


	As of September 30,
	2013			2012
Accounts receivable — billed	$	587,928		$	573,090
Accounts receivable — unbilled		110,626			130,697
Less — allowances		(20,335	)		(16,564	)

Accounts receivable, net	$	678,219		$	687,223

Equipment and Leasehold Improvements, Net

12 Months Ended

Sep. 30, 2013

Property Plant And Equipment [Abstract]

Equipment and Leasehold Improvements, Net

Note 8 — Equipment and Leasehold Improvements, Net

Components of equipment and leasehold improvements, net are:


	As of September 30,
	2013			2012
Computer equipment	$	1,020,643		$	967,381
Leasehold improvements		189,655			174,568
Furniture, fixtures and other		63,158			59,972

		1,273,456			1,201,921
Less accumulated depreciation		(997,912	)		(924,014	)

	$	275,544		$	277,907

Total depreciation expense on equipment and leasehold improvements for fiscal years 2013, 2012 and 2011, was $104,624, $107,470 and $113,910, respectively.

As of September 30, 2013 and 2012, the unamortized software assets developed for internal use were $68,255 and $57,960, respectively.

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Goodwill and Intangible Assets, Net

12 Months Ended

Sep. 30, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, Net

Note 9 — Goodwill and Intangible Assets, Net

The following table presents details of the Company’s total goodwill:


As of October 1, 2011	$	1,739,732
Other		2,054

As of September 30, 2012		1,741,786
Goodwill resulting from an immaterial acquisition(1)		80,193
Other		(3,645	)

As of September 30, 2013	$	1,818,334

(1)

In allocating the total preliminary purchase price of Actix, based on estimated fair values, the Company recorded $80,193 of goodwill, $2,700 of in-process research and development (indefinite life), $27,200 of core technology amortized over approximately four years, $19,500 of customer relationships amortized over approximately four years and $2,200 of other intangible assets amortized over approximately five years.

The following table presents details regarding the Company’s total definite-lived purchased intangible assets:


	Estimated Useful Life (in years)		Gross		Accumulated Amortization			Net
September 30, 2013
Core technology		4-8	$	408,256	$	(344,251	)	$	64,005
Customer relationships		4-15		346,707		(267,252	)		79,455
Intellectual property rights and purchased computer software		—		51,996		(51,996	)		—
Other		5-10		25,282		(14,716	)		10,566

Total			$	832,241	$	(678,215	)	$	154,026

September 30, 2012
Core technology		4-8	$	381,056	$	(332,322	)	$	48,734
Customer relationships		6-15		327,207		(245,119	)		82,088
Intellectual property rights and purchased computer software		—		51,996		(51,996	)		—
Other		2-10		23,082		(12,626	)		10,456

Total			$	783,341	$	(642,063	)	$	141,278

The following table presents the amortization expense of the Company’s definite-lived purchased intangible assets, included in each financial statement caption reported in the consolidated statements of income:


	Year Ended September 30,
	2013		2012		2011
Cost of service	$	1,609	$	1,609	$	1,609
Amortization of definite-lived purchased intangible assets		34,543		50,535		65,958

Total	$	36,152	$	52,144	$	67,567

The Company performs an annual goodwill impairment test during the fourth quarter of each fiscal year, or more frequently if impairment indicators are present. The Company operates in one operating segment, and this segment comprises its only reporting unit. In calculating the fair value of the reporting unit, the Company uses its market capitalization and a discounted cash flow methodology. There was no impairment of goodwill in fiscal 2013, 2012 and 2011.

The estimated future amortization expense of definite-lived purchased intangible assets as of September 30, 2013 is as follows:


	Amount
Fiscal year:
2014	$	37,425
2015		32,668
2016		29,521
2017		25,982
2018		16,855
Thereafter		11,575

Total	$	154,026

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Other Noncurrent Assets

12 Months Ended

Sep. 30, 2013

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Noncurrent Assets

Note 10 — Other Noncurrent Assets

Other noncurrent assets consist of the following:


	As of September 30,
	2013		2012
Funded employee benefit costs(1)	$	165,899	$	137,299
Deferred costs(2)		38,281		71,089
Long term accounts receivable-unbilled		4,917		17,198
Prepaid expense		7,346		10,344
Other		62,726		79,986

	$	279,169	$	315,916

(1)	Primarily funding for severance pay liability in accordance with Israeli law. Please see Note 17 to the consolidated financial statements.

(2)	Please see Note 2 (revenue recognition) to the consolidated financial statements.

Income Taxes

12 Months Ended

Sep. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

Note 11 — Income Taxes

The provision (benefit) for income taxes consists of the following:


	Year Ended September 30,
	2013		2012			2011
Current	$	50,553	$	55,010		$	47,790
Deferred		12,485		(4,857	)		1,252

	$	63,038	$	50,153		$	49,042

All income taxes are from continuing operations reported by the Company in the applicable taxing jurisdiction. Income taxes also include anticipated withholding taxes due on subsidiaries’ earnings when paid as dividends to the Company.

During fiscal 2013, the Company recognized $14,671 of deferred income tax expenses as a result of enacted changes in tax laws or rates.

The Company’s deferred income tax expense as a result of enacted changes in tax laws or rates was immaterial in fiscal years 2012 and 2011.

Deferred income taxes are comprised of the following components:


	As of September 30,
	2013			2012
Deferred tax assets:
Deferred revenue	$	50,623		$	38,214
Employee compensation and benefits		75,356			74,248
Intangible assets, computer software and intellectual property		11,518			13,747
Tax credits, net capital and operating loss carryforwards		166,639			168,015
Other		40,754			37,902

Total deferred tax assets		344,890			332,126
Valuation allowances(1)		(127,202	)		(117,011	)

Total deferred tax assets, net		217,688			215,115

Deferred tax liabilities:
Anticipated withholdings on subsidiaries’ earnings		(53,095	)		(40,175	)
Intangible assets, computer software and intellectual property		(109,354	)		(101,583	)
Other		(34,990	)		(28,131	)

Total deferred tax liabilities		(197,439	)		(169,889	)

Net deferred tax assets	$	20,249		$	45,226

(1)	Subsequent releases of the valuation allowances, if any, will be recognized through earnings.

The effective income tax rate varied from the statutory Guernsey tax rate as follows:


	Year Ended September 30,
	2013			2012			2011
Statutory Guernsey tax rate		0	%		0	%		0	%
Foreign taxes(2)		13			11			12

Effective income tax rate		13	%		11	%		12	%

(2)	In fiscal 2013, foreign taxes include a benefit of $29,786 attributable to the expiration during fiscal 2013 of the statutes of limitations related to unrecognized tax benefits accumulated over several years in certain jurisdictions.

As a Guernsey company subject to a corporate tax rate of zero percent, the Company’s overall effective tax rate is attributable to foreign taxes. The Company’s income before income tax expense is considered to be foreign income.

During fiscal 2013, the net increase in valuation allowances was $10,191, which related to the uncertainty of realizing tax benefits primarily for tax credits, net capital and operating loss carryforwards related to certain of the Company’s subsidiaries. As of September 30, 2013, the Company had tax credits, net capital and operating loss carryforwards of $547,875, of which $173,864 have expiration dates through 2033, and the remainder do not expire.

During fiscal 2012, the net decrease in valuation allowances was $20,825, which related to the uncertainty of realizing tax benefits primarily for tax credits, net capital and operating loss carryforwards related to certain of the Company’s subsidiaries. As of September 30, 2012, the Company had tax credits, net capital and operating loss carryforwards of $540,945, of which $162,844 have expiration dates through 2032, and the remainder do not expire.

The aggregate changes in the balance of the Company’s gross unrecognized tax benefits were as follows:


	Year Ended September 30,
	2013			2012			2011
Balance at beginning of fiscal year	$	133,874		$	132,861		$	118,662
Additions based on tax positions related to the current year		19,527			20,183			19,849
Additions for tax positions of prior years		10,750			4,918			3,548
Reductions for tax positions of prior years		—			(5,527	)		—
Settlements with tax authorities		(3,994	)		(3,290	)		(5,231	)
Lapse of statute of limitations		(29,786	)		(15,271	)		(3,967	)

Balance at end of fiscal year	$	130,371		$	133,874		$	132,861

The total amount of unrecognized tax benefits, which includes interest and penalties, was $130,371 as of September 30, 2013, all of which would affect the effective tax rate if realized.

The Company recognizes interest and penalties related to unrecognized tax benefits in the provision for income taxes. As of September 30, 2013, the Company had accrued $19,126 in income taxes payable for interest and penalties relating to unrecognized tax benefits, of which $422 was recognized in the statements of income in fiscal 2013. As of September 30, 2012, the Company had accrued $18,704 in income taxes payable for interest and penalties relating to unrecognized tax benefits, of which $731 was recognized in the statements of income in fiscal 2012.

The Company is currently under audit in several jurisdictions for the tax years 2007 and onwards. Timing of the resolution of audits is highly uncertain and therefore the Company generally cannot estimate the change in unrecognized tax benefits resulting from these audits within the next 12 months.

The Company believes that the amount of unrecognized tax benefits will increase during fiscal 2014 in the ordinary course of business. In addition it is reasonably possible that the amount of unrecognized tax benefits will decrease by $18,385 as a result of lapse of statutes of limitations in jurisdictions in which the Company operates.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Repurchase of Shares	12 Months Ended
Repurchase of Shares	Sep. 30, 2013
Equity [Abstract]
Repurchase of Shares	Note 12 — Repurchase of Shares From time to time, the Company’s board of directors has adopted share repurchase plans authorizing the repurchase of the Company’s outstanding ordinary shares. The current share repurchase plan authorizes the repurchase of up to $500,000 of the Company’s outstanding ordinary shares with no expiration date. In fiscal 2013, the Company repurchased approximately 10,370 ordinary shares at an average price of $35.38 per share (excluding broker and transaction fees). As of September 30, 2013, the Company had remaining authority to repurchase up to $335,866 of its outstanding ordinary shares. The authorization permits the Company to purchase its ordinary shares in open market or privately negotiated transactions at times and prices that it considers appropriate.

Financing Arrangements	12 Months Ended
Financing Arrangements	Sep. 30, 2013
Debt Disclosure [Abstract]
Financing Arrangements	Note 13 — Financing Arrangements In December 2011, the Company entered into a $500,000 five-year revolving credit facility with a syndicate of banks. The credit facility is available for general corporate purposes, including acquisitions and repurchases of ordinary shares that the Company may consider from time to time. The interest rate for borrowings under the revolving credit facility is chosen at the Company’s option from several pre-defined alternatives, depends on the circumstances of any advance and is based in part on the Company’s credit ratings. As of September 30, 2013, the Company was in compliance with the financial covenants under the revolving credit facility. In September 2013, the Company borrowed an aggregate of $200,000 under the facility and repaid it in October 2013. In September 2012, the Company borrowed an aggregate of $200,000 under the facility and repaid it in October 2012. As of September 30, 2013, the Company had several uncommitted lines of credit available for general corporate and other specific purposes. As of September 30, 2013, the Company had outstanding letters of credit and bank guarantees of $64,331. These were supported by a combination of unused lines of credit and restricted cash balances that the Company maintains with various banks.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Other Noncurrent Liabilities

12 Months Ended

Sep. 30, 2013

Other Liabilities Disclosure [Abstract]

Other Noncurrent Liabilities

Note 14 — Other Noncurrent Liabilities

Other noncurrent liabilities consists of the following:


	As of September 30,
	2013		2012
Accrued employees costs(1)	$	210,335	$	180,563
Noncurrent deferred revenue		22,641		30,988
Accrued pension liability(2)		16,189		21,373
Other		11,644		11,744

	$	260,809	$	244,668

(1)	Primarily severance pay liability in accordance with Israeli law. Please see Note 17 to the consolidated financial statements.

(2)	Primarily relates to funded status of non-contributory defined benefit plans. Please see Note 17 to the consolidated financial statements.

Interest and Other Expense, Net

12 Months Ended

Sep. 30, 2013

Other Income And Expenses [Abstract]

Interest and Other Expense, Net

Note 15 — Interest and other expense, net

Interest and other expense, net, consists of the following:


	Year Ended September 30,
	2013			2012			2011
Interest income	$	(4,915	)	$	(5,478	)	$	(6,180	)
Interest expense		3,557			3,175			2,882
Foreign exchange loss		4,279			7,378			9,737
Gain on sale of investments(1)		—			(9,172	)		—
Other, net		3,154			5,045			2,218

	$	6,075		$	948		$	8,657

(1)	Includes primarily a gain of $6,270 on the sale of remaining minority interest in Longshine Information Technology Company Ltd.

Contingencies

12 Months Ended

Sep. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Contingencies

Note 16 — Contingencies

Commitments

The Company leases office space and vehicles under non-cancelable operating leases in various countries in which it does business. Future minimum non-cancelable lease payments based on the Company’s contractual obligations as of September 30, 2013 are as follows:


For the year ended September 30,
2014	$	63,797
2015		46,730
2016		42,454
2017		34,833
2018		30,140
Thereafter		66,257

	$	284,211

Future minimum non-cancelable lease payments, as stated above, do not reflect committed future sublease income of $2,245, $1,310, $725, $306 and $317 for the years ended September 30, 2014, 2015, 2016, 2017 and 2018, respectively.

Rent expense net of sublease income was approximately $45,610, $41,488 and $40,104 for fiscal 2013, 2012 and 2011, respectively.

Legal Proceedings

The Company is involved in various legal proceedings arising in the normal course of its business. The Company accrues for a loss contingency when it determines that it is more likely than not, after consultation with counsel, that a liability has been incurred and the amount of such loss can be reasonably estimated. At this time, the Company believes that the results of any such contingencies, either individually or in the aggregate, will not have a material adverse effect on the Company’s financial position, results of operations or cash flows.

Guarantor’s Accounting and Disclosure Requirements for Guarantees

The Company generally offers its products with a limited warranty for a period of 90 days. The Company’s policy is to accrue for warranty costs, if needed, based on historical trends in product failure. Based on the Company’s experience, only minimal warranty charges have been required after revenue was fully recognized and, as a result, the Company did not accrue any amounts for product warranty liability during fiscal years 2013, 2012 and 2011.

The Company generally indemnifies its customers against claims of intellectual property infringement made by third parties arising from the use of the Company’s software. To date, the Company has incurred and recorded only minimal costs as a result of such obligations in its consolidated financial statements.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Employee Benefits	12 Months Ended
Employee Benefits	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]
Employee Benefits	Note 17 — Employee Benefits The Company accrues severance pay for the employees of its Israeli operations in accordance with Israeli law and certain employment procedures on the basis of the latest monthly salary paid to these employees and the length of time that they have worked for the Israeli operations. The severance pay liability, which is included as accrued employee costs in other noncurrent liabilities, is partially funded by amounts on deposit with insurance companies, which are included in other noncurrent assets. These accrued severance expenses were $22,326, $24,611 and $28,054 for fiscal 2013, 2012 and 2011, respectively. The Company sponsors defined contribution plans covering certain of its employees around the world. The plans primarily provide for Company matching contributions based upon a percentage of the employees’ contributions. The Company’s contributions in fiscal 2013, 2012 and 2011 under such plans were not material compared to total operating expenses. The Company maintains non-contributory defined benefit plans that provide for pension, other retirement and post employment benefits for certain employees of a Canadian subsidiary based on length of service and rate of pay. The Company accrues its obligations to these employees under employee benefit plans and the related costs net of returns on plan assets. Pension expense and other retirement benefits earned by employees are actuarially determined using the projected benefit method pro-rated on service and based on management’s best estimates of expected plan investments performance, salary escalation, retirement ages of employees, discount rate, inflation and expected health care costs. The Company recognized the funded status of such plans in the balance sheet. The fair value of the employee benefit plans’ assets is based on market values. The plan assets are valued at market value for the purpose of calculating the expected return on plan assets and the amortization of experienced gains and losses. Past service costs, which may arise from plan amendments, are amortized on a straight-line basis over the average remaining service period of the employees who were active at the date of amendment. The excess of the net actuarial gain (loss) over 10% of the greater of the benefit obligation and the market-related value of plan assets is amortized over the average remaining service period of active employees. The pension and other benefits costs related to the non-contributory defined benefit plans were immaterial in fiscal 2013, 2012 and 2011.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Stock Option and Incentive Plan

12 Months Ended

Sep. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option and Incentive Plan

Note 18 — Stock Option and Incentive Plan

In January 1998, the Company adopted the 1998 Stock Option and Incentive Plan (the “Plan”), which provides for the grant of restricted stock awards, stock options and other equity-based awards to employees, officers, directors, and consultants. The purpose of the Plan is to enable the Company to attract and retain qualified personnel and to motivate such persons by providing them with an equity participation in the Company. Since its adoption, the Plan has been amended on several occasions to, among other things, increase the number of ordinary shares issuable under the Plan. The maximum number of ordinary shares currently authorized to be granted under the Plan is 62,300. Awards granted under the Plan generally vest over a period of four years and stock options have a term of ten years.

The following table summarizes information about options to purchase the Company’s ordinary shares, as well as changes during the fiscal year ended September 30, 2013:


	Number of Share Options			Weighted Average Exercise Price
Outstanding as of October 1, 2012		17,654		$	29.27
Granted		2,821			35.02
Exercised		(7,243	)		29.47
Forfeited		(1,094	)		30.44

Outstanding as of September 30, 2013(1)		12,138		$	30.38

Exercisable as of September 30, 2013(1)		5,045		$	29.53

(1)	At September 30, 2013, the weighted average remaining contractual life of outstanding and exercisable options was 6.93 and 4.96 years, respectively.

The following table summarizes information relating to awards of restricted shares, as well as changes during the fiscal year ended September 30, 2013:


	Number of Shares			Weighted Average Grant Date Fair Value
Outstanding as of October 1, 2012		1,673		$	28.36
Granted		928			34.82
Vested		(613	)		27.89
Forfeited		(193	)		30.65

Outstanding as of September 30, 2013		1,795		$	31.61

The total intrinsic value of options exercised during fiscal 2013, 2012 and 2011 was $44,604, $22,929 and $19,394, respectively.

The value of restricted shares vested during fiscal 2013, 2012 and 2011 was $20,891, $15,594 and $12,376, respectively.

The following table summarizes information about stock options outstanding as of September 30, 2013:


Outstanding							Exercisable
Exercise Price	Number Outstanding		Weighted Average Remaining Contractual Life (in Years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$ 0.38 — 26.34		660		4.03	$	19.21		654	$	19.15
26.38 — 26.88		1,587		6.39		26.56		666		26.53
27.12 — 28.66		2,378		7.15		28.48		915		28.35
28.70 — 29.44		2,700		7.81		29.29		775		29.23
29.72 — 34.96		2,365		5.76		33.25		1,430		33.48
35.45 — 35.69		1,774		8.42		35.65		310		35.45
35.70 — 39.60		674		6.91		37.44		295		38.35

The aggregate intrinsic value of outstanding and exercisable stock options as of September 30, 2013 was $76,647 and $36,404, respectively.

Employee equity-based compensation pre-tax expense for the years ended September 30, 2013, 2012 and 2011 was as follows:


	Year Ended September 30,
	2013		2012		2011
Cost of service	$	18,284	$	22,641	$	14,641
Research and development		3,805		4,320		2,701
Selling, general and administrative		18,251		16,468		19,289

Total	$	40,340	$	43,429	$	36,631

The total income tax benefit recognized in the income statement for stock-based compensation (including restricted shares) for fiscal 2013, 2012 and 2011 was $4,150, $6,254 and $2,350, respectively.

As of September 30, 2013, there was $35,746 of unrecognized compensation expense related to unvested stock options and unvested restricted stock awards. The Company recognizes compensation costs using the graded vesting attribution method, which results in a weighted average period of approximately one year over which the unrecognized compensation expense is expected to be recognized.

The fair value of options granted was estimated on the date of grant using the Black-Scholes pricing model with the assumptions noted in the following table (all in weighted averages for options granted during the year):


	Year Ended September 30,
	2013			2012			2011
Risk-free interest rate(1)		0.74	%		0.70	%		1.50	%
Expected life of stock options(2)		4.50			4.50			4.50
Expected volatility(3)		22.7	%		28.5	%		30.5	%
Expected dividend yield(4)		1.48	%		0.02	%		None
Fair value per option	$	5.74		$	7.18		$	7.76

(1)	Risk-free interest rate is based upon U.S. Treasury yield curve appropriate for the term of the Company’s employee stock options.

(2)	Expected life of stock options is based upon historical experience.

(3)	Expected volatility is based on blended volatility. Please see Note 2 to the consolidated financial statements.

(4)	Expected dividend yield is based on the Company’s history and future expectation of dividend payouts.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Dividends

12 Months Ended

Sep. 30, 2013

Text Block [Abstract]

Dividends

Note 19 — Dividends

The Company’s board of directors declared the following dividends during the fiscal year ended September 30, 2013:


Declaration Date	Dividends Per Ordinary Share		Record Date	Total Amount		Payment Date
November 6, 2012	$	0.13	December 31, 2012	$	21,032	January 18, 2013
January 30, 2013	$	0.13	March 28, 2013	$	20,927	April 19, 2013
April 30, 2013	$	0.13	June 28, 2013	$	20,929	July 19, 2013
July 31, 2013	$	0.13	September 30, 2013	$	20,812	October 18, 2013

The amount payable as a result of the July 31, 2013 declaration was included in other current liabilities as of September 30, 2013.

On November 5, 2013, the Company’s board of directors approved the next quarterly dividend payment, at the rate of $0.13 per share, and set December 31, 2013 as the record date for determining the shareholders entitled to receive the dividend, which is payable on January 17, 2014.

The Company’s board of directors also approved on November 5, 2013 an increase in the rate of the quarterly cash dividend to $0.155 per share, which would be payable on April 17, 2014. This increase is subject to shareholder approval at the January 2014 annual general meeting of shareholders.

Earnings Per Share

12 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Earnings Per Share

Note 20 — Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:


	Year Ended September 30,
	2013		2012		2011
Numerator:
Numerator for basic and diluted earnings per share	$	412,439	$	391,371	$	346,665

Denominator:
Denominator for basic earnings per share — weighted average number of shares outstanding		161,330		168,275		185,213
Effect of assumed conversion of 0.50% convertible notes		24		24		24
Effect of dilutive stock options granted		1,764		1,138		1,322

Denominator for dilutive earnings per share — adjusted weighted average shares and assumed conversions		163,118		169,437		186,559

Basic earnings per share	$	2.56	$	2.33	$	1.87

Diluted earnings per share	$	2.53	$	2.31	$	1.86

The weighted average effect of the repurchase of ordinary shares by the Company has been included in the calculation of basic earnings per share.

For the fiscal years ended September 30, 2013, 2012 and 2011, 3,005, 12,313 and 14,970 weighted average number of shares, respectively, were attributable to antidilutive outstanding stock options and therefore were not included in the calculation of diluted earnings per share.

Segment Information and Sales to Significant Customers

12 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Segment Information and Sales to Significant Customers

Note 21 — Segment Information and Sales to Significant Customers

The Company and its subsidiaries operate in one operating segment, providing software products and services for the communications, media and entertainment industry service providers.

Geographic Information

The following is a summary of revenue and long-lived assets by geographic area. Revenue is attributed to geographic region based on the location of the customers.


	Year Ended September 30,
	2013		2012		2011
Revenue
North America (Mainly United States)	$	2,423,067	$	2,266,110	$	2,333,096
Europe		398,400		441,731		403,115
Rest of the world		524,387		539,062		441,517

Total	$	3,345,854	$	3,246,903	$	3,177,728


	As of September 30,
	2013		2012		2011
Long-lived Assets(1)
North America (Mainly United States)	$	72,855	$	83,645	$	102,739
Europe		78,501		65,746		47,717
Rest of the world:
Israel		56,683		51,086		45,669
India		25,036		29,401		35,071
Others		42,469		48,029		27,206

Total	$	275,544	$	277,907	$	258,402

(1)	Includes equipment and leasehold improvements.

Revenue and Customer Information

Customer experience systems include the following offerings: revenue management, customer management, operations support systems (OSS), network control, digital services and M2M solutions. Customer experience systems also include a comprehensive line of services such as consulting, systems integration and transformation, testing, information technology outsourcing (ITO) and value process operation, managed services and product support, system implementation, integration, modification, consolidation, modernization, ongoing support, enhancement and maintenance. Directory includes comprehensive set of products and services for local marketing service providers and search and directory publishers.


	Year Ended September 30,
	2013		2012		2011
Customer experience systems	$	3,185,637	$	3,066,170	$	2,978,288
Directory		160,217		180,733		199,440

Total	$	3,345,854	$	3,246,903	$	3,177,728

Sales to Significant Customers

The following table summarizes the percentage of sales to significant customer groups (when they amount to at least 10 percent of total revenue for the year).


	Year Ended September 30,
	2013			2012			2011
Customer 1		28	%		26	%		29	%
Customer 2		*			10			11
Customer 3		*			*			10

*	Represents an amount of less than 10%.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Unaudited Quarterly Results of Operations

12 Months Ended

Sep. 30, 2013

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Results of Operations

Note 22 — Selected Quarterly Results of Operations (Unaudited)

The following are details of the unaudited quarterly results of operations for the three months ended:


	September 30,		June 30,		March 31,		December 31,
2013
Revenue	$	845,225	$	841,332	$	832,938	$	826,359
Operating income		122,876		123,164		122,855		112,657
Net income		88,954		119,558		104,912		99,015
Basic earnings per share		0.55		0.74		0.65		0.61
Diluted earnings per share		0.54		0.73		0.64		0.61
2012
Revenue	$	822,128	$	808,837	$	808,928	$	807,010
Operating income		113,501		110,051		109,872		109,048
Net income		98,021		98,749		101,870		92,731
Basic earnings per share		0.60		0.59		0.60		0.54
Diluted earnings per share		0.60		0.59		0.60		0.53

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Subsequent Event	12 Months Ended
Subsequent Event	Sep. 30, 2013
Subsequent Events [Abstract]
Subsequent Event	Note 23 — Subsequent Event On November 5, 2013, the Company entered into a definitive agreement to acquire substantially all the assets of Celcite Management Solutions LLC (“Celcite”), for approximately $129,000 in cash, subject to customary closing conditions. Additional consideration may be paid later based on the achievement of agreed performance metrics. Celcite is a leading provider of network management solutions. The transaction is expected to close towards the end of the first quarter of fiscal 2014, or in the beginning of the second quarter of fiscal 2014.

Valuation and Qualifying Accounts

12 Months Ended

Sep. 30, 2013

Valuation And Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

Note 23 — Subsequent Event

On November 5, 2013, the Company entered into a definitive agreement to acquire substantially all the assets of Celcite Management Solutions LLC (“Celcite”), for approximately $129,000 in cash, subject to customary closing conditions. Additional consideration may be paid later based on the achievement of agreed performance metrics. Celcite is a leading provider of network management solutions. The transaction is expected to close towards the end of the first quarter of fiscal 2014, or in the beginning of the second quarter of fiscal 2014.

VALUATION AND QUALIFYING ACCOUNTS

(In thousands)


	Accounts Receivable Allowances			Valuation Allowances on Net Deferred Tax Assets
Balance as of October 1, 2010	$	11,428		$	106,743
Charged to costs and expenses		7,602			24,372	(1)
Charged to other accounts		3,620	(3)		16,685	(2)
Deductions		(7,084	)		(9,964	)(4)

Balance as of September 30, 2011		15,566			137,836
Charged to costs and expenses		4,498			23,708	(5)
Charged to other accounts		1,659	(3)		—
Deductions		(5,159	)		(44,533	)(6)

Balance as of September 30, 2012		16,564			117,011
Charged to costs and expenses		5,851			23,199	(7)
Charged to other accounts		1,176	(9)		2,552	(8)
Deductions		(3,256	)		(15,560	)(10)

Balance as of September 30, 2013	$	20,335		$	127,202

(1)	Valuation allowances on deferred tax assets incurred during fiscal 2011.

(2)	Includes valuation allowances on deferred tax assets incurred in connection with an immaterial acquisition in fiscal 2011.

(3)	$1,488 and $640 were related to an immaterial acquisition in fiscal 2011 and were charged to other accounts during fiscal 2011 and 2012, respectively.

(4)	$4,060 of valuation allowances on deferred tax assets were written off against the related deferred tax assets, and the remaining deductions in the valuation allowances on net deferred tax assets were released to earnings.

(5)	Valuation allowances on deferred tax assets incurred during fiscal 2012.

(6)	$38,268 of valuation allowances on deferred tax assets were written off against the related deferred tax assets which expired unused, and the remaining deductions in the valuation allowances on net deferred tax assets were released to earnings.

(7)	Valuation allowances on deferred tax assets incurred during fiscal 2013.

(8)	Includes valuation allowances on deferred tax assets incurred in connection with an immaterial acquisition in fiscal 2013.

(9)	$109 was related to an immaterial acquisition in fiscal 2013 and was charged to other accounts during fiscal 2013.

(10)	$7,707 of valuation allowances on deferred tax assets were written off against the related deferred tax assets, and the remaining deductions in the valuation allowances on net deferred tax assets were released primarily to earnings.

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2013
Accounting Policies [Abstract]
Basis of Presentation	*Basis of Presentation* The consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles, or U.S. GAAP.
Consolidation	*Consolidation* The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.
Use of Estimates	*Use of Estimates* The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.
Reclassifications	*Reclassifications* From time to time, certain immaterial amounts in prior years’ financial statements may be reclassified to conform to the current year’s presentation.
Functional Currency	*Functional Currency* The Company manages its foreign subsidiaries as integral direct components of its operations. The operations of the Company’s foreign subsidiaries provide the same type of services with the same type of expenditures throughout the Amdocs group. The Company has determined that its functional currency is the U.S. dollar. The Company periodically assesses the applicability of the U.S. dollar as the Company’s functional currency by reviewing the salient indicators as indicated in the authoritative guidance for foreign currency matters.
Cash and Cash Equivalents	*Cash and Cash Equivalents* Cash and cash equivalents consist of cash and interest-bearing investments with insignificant interest rate risk and maturities from acquisition date of 90 days or less.
Investments	*Investments* The Company classifies all of its short-term interest-bearing investments as available-for-sale securities. Such short-term interest-bearing investments consist primarily of money market funds, U.S. government treasuries, corporate bonds and U.S. agency securities, which are stated at market value. Unrealized gains and losses are comprised of the difference between market value and amortized costs of such securities and are reflected, net of tax, as “accumulated other comprehensive income (loss)” in shareholders’ equity, unless a security is other than temporarily impaired. The Company recognizes an impairment charge in earnings when a decline in the fair value of its investments below the cost basis is judged to be other-than-temporary. For securities with an unrealized loss that the Company intends to sell, or it is more likely than not that the Company will be required to sell before recovery of their amortized cost basis, the entire difference between amortized cost and fair value is recognized in earnings. For securities that do not meet these criteria, the amount of impairment recognized in earnings is limited to the amount related to credit losses, while other declines in fair value related to other factors are recognized in other comprehensive income (loss). The Company uses a discounted cash flow analysis to determine the portion of the impairment that relates to the credit losses. To the extent that the net present value of the projected cash flows is less than the amortized cost of the security, the difference is considered credit loss. Realized gains and losses on short-term interest-bearing investments are included in earnings and are derived using the first in first out (FIFO) method for determining the cost of securities.
Equipment and Leasehold Improvements	*Equipment and Leasehold Improvements* Equipment and leasehold improvements are stated at cost. Assets under capital leases are recorded at the present value of the future minimum lease payments at the date of acquisition. Depreciation is computed using the straight-line method over the estimated useful life of the asset, which primarily ranges from three to ten years and includes the amortization of assets under capitalized leases. Leasehold improvements are amortized over the shorter of the estimated useful lives or the term of the related lease. The Company capitalizes certain expenditures for software that is internally developed for use in the business, which is classified as computer equipment. Amortization of internal use software begins when the software is ready for service and continues on the straight-line method over the estimated useful life.
Goodwill, Intangible Assets and Long-Lived Assets	*Goodwill, Intangible Assets and Long-Lived Assets* Goodwill and intangible assets deemed to have indefinite lives are subject to an annual impairment test or more frequently if impairment indicators are present. Goodwill impairment is deemed to exist if the net book value of a reporting unit exceeds its estimated fair value. The goodwill impairment test involves a two-step process. The first step, identifying a potential impairment, compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying value of the reporting unit exceeds its fair value, the second step would need to be conducted; otherwise, no further steps are necessary as no potential impairment exists. The second step, measuring the impairment loss, compares the implied fair value of the reporting unit goodwill with the carrying amount of that goodwill. Any excess of the reporting unit goodwill carrying value over the respective implied fair value is recognized as an impairment loss. The total purchase price of business acquisitions accounted for using the purchase method is allocated first to identifiable assets and liabilities based on estimated fair values. The excess of the purchase price over the fair value of net assets of purchased businesses is recorded as goodwill. Other definite-life intangible assets consist primarily of core technology, customer relationships and trademarks. Core technology and trademarks acquired by the Company are amortized over their estimated useful lives on a straight-line basis. Some of the acquired customer relationships are amortized over their estimated useful lives in proportion to the economic benefits realized. This accounting policy generally results in accelerated amortization of such customer relationships as compared to the straight-line method. All other acquired customer relationships are amortized over their estimated useful lives on a straight-line basis. The Company tests long-lived assets, including definite life intangible assets, for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Determination of recoverability of long-lived assets is based on an estimate of the undiscounted future cash flows resulting from the use of the cash generating unit and its eventual disposition. Measurement of an impairment loss for long-lived assets, including definite life intangible assets that management expects to hold and use is based on the fair value of the cash generating unit. Long-lived assets, including definite life intangible assets, to be disposed of are reported at the lower of carrying amount or fair value less costs to sell.
Comprehensive Income	*Comprehensive Income* Comprehensive income, net of related taxes where applicable, includes, in addition to net income: (i) unrealized gains and losses on available-for-sale securities; (ii) unrealized gains and losses in respect of derivative instruments designated as a cash flow hedge; and (iii) unrealized gains and losses on defined benefit plans.
Treasury Stock	*Treasury Stock* The Company repurchases its ordinary shares from time to time on the open market or in other transactions and holds such shares as treasury stock. The Company presents the cost to repurchase treasury stock as a reduction of shareholders’ equity.
Income Taxes	*Income Taxes* The Company records deferred income taxes to reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting and tax purposes. Deferred taxes are computed based on tax rates anticipated to be in effect when the deferred taxes are expected to be paid or realized. A valuation allowance is provided for deferred tax assets if it is more likely than not, the Company will not be able to realize their benefit. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting, or according to the expected reversal dates of the specific temporary differences if not related to an asset or liability for financial reporting, and also include anticipated withholding taxes due on subsidiaries’ earnings when paid as dividends to the Company. The Company recognizes the tax benefit from an uncertain tax position only if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The tax benefits recognized in the financial statements from such a position is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. The Company will classify the liability for unrecognized tax benefits as current to the extent that the Company anticipates payment of cash within one year. Interest and penalties related to uncertain tax positions are recognized in the provision for income taxes. Please see Note 11 to the consolidated financial statements.
Revenue Recognition	*Revenue Recognition* Revenue is recognized only when all of the following conditions have been met: (i) there is persuasive evidence of an arrangement; (ii) delivery has occurred; (iii) the fee is fixed or determinable; and (iv) collectibility of the fee is reasonably assured. The Company usually sells its software licenses as part of an overall solution offered to a customer that combines the sale of software licenses with a broad range of services, which normally include significant customization, modification, implementation and integration. Those services are deemed essential to the software. As a result, combined license and service revenue is generally recognized over the course of these long-term projects, using the percentage of completion method of accounting. When total cost estimates for these types of arrangements exceed revenues in a fixed-price arrangement, the estimated losses are recognized immediately based upon the cost applicable to the delivering unit. Initial license fee for software revenue is recognized as work is performed, under the percentage of completion method of accounting. Subsequent license fee revenue is recognized upon completion of specified conditions in each contract, based on a customer’s subscriber level or transaction volume or other measurements when greater than the level specified in the contract for the initial license fee. Service revenue that involves significant ongoing obligations, including fees for software customization, modification, implementation and integration as part of a long-term contract, is recognized as work is performed, under the percentage of completion method of accounting. Revenue from software solutions that do not require significant customization, implementation and modification is recognized upon delivery. Service revenue that does not involve significant ongoing obligations is recognized as services are rendered. Fees are generally considered fixed and determinable unless a significant portion (more than 10%) of the license and related service fee is due more than 12 months after delivery, in which case license and related services fees are recognized when payments are due. In managed services contracts and in other long term contracts, revenue from the operation of a customer’s system is recognized either as services are performed based on time elapsed, output produced, volume of data processed or subscriber count, depending on the specific contract terms of the managed services arrangement. Typically, managed services contracts are long term in duration and are not subject to seasonality. Revenue from ongoing support services is recognized as work is performed. Revenue from third-party hardware sales is recognized upon delivery and installation, and revenue from third-party software sales is recognized upon delivery. Revenue from third-party hardware and software sales is recorded at gross amount for transactions in which the Company is the primary obligor under the arrangement as well as, in some cases, possesses other attributes such as latitude in determining prices and selecting suppliers. In specific circumstances where the Company does not meet the above criteria, particularly when the contract stipulates that the Company is not the primary obligor, the Company recognizes revenue on a net basis. Revenue from third-party sales is included in service revenue and was less than 10% of total revenue in each of fiscal 2013, 2012 and 2011. In certain arrangements, the Company may earn revenue from other third-party services which is recorded at a gross amount as the Company is the primary obligor under the arrangement. Maintenance revenue is recognized ratably over the term of the maintenance agreement, which in most cases is one year. As a result of a significant portion of the Company’s revenue being subject to the percentage of completion accounting method, the Company’s annual and quarterly operating results may be significantly affected by the size and timing of customer projects and the Company’s progress in completing such projects. Many of the Company’s agreements include multiple deliverables. The Company’s multiple element arrangements are comprised of a variety of different combinations of the deliverables mentioned above. For multiple element arrangements within the scope of software revenue recognition guidance, the Company allocates revenue to each element based upon its relative fair value as determined by Vendor Specific Objective Evidence (“VSOE”). In the absence of fair value for a delivered element the Company uses the residual method. The residual method requires that the Company first allocate revenue to the fair value of the undelivered elements and residual revenue to delivered elements. If VSOE of any undelivered items does not exist, revenue from the entire arrangement is deferred and recognized at the earlier of (i) delivery of those elements for which VSOE does not exist or (ii) when VSOE can be established. However, in limited cases where maintenance is the only undelivered element without VSOE, the entire arrangement fee is recognized ratably upon commencement of the maintenance services. The residual method is used mainly in multiple element arrangements that include license for the sale of software solutions that do not require significant customization, modification, implementation and integration and maintenance to determine the appropriate value for the license component. Under the guidance for revenue arrangements with multiple deliverables that are outside the scope of the software revenue recognition guidance, the Company allocates revenue to each element based upon the relative fair value. Fair value would be allocated by using a hierarchy of 1) VSOE, 2) third-party evidence of selling price for that element, or 3) estimated selling price, or ESP, for individual elements of an arrangement when VSOE or third-party evidence of selling price is unavailable. This results in the elimination of the residual method of allocating revenue consideration. The Company determines ESP for the purposes of allocating the consideration to individual elements of an arrangement by considering several external and internal factors including, but not limited to, pricing practices, margin objectives, geographies in which the Company offers its services and internal costs. The determination of ESP is judgmental and is made through consultation with and approval by management. In certain circumstances where the Company enters into a contract with a customer for the provision of managed services for a defined period of time, the Company defers certain direct costs incurred at the inception of the contract. These costs include time and expense incurred in association with the origination of a contract. In addition, if the revenue for a delivered item is not recognized because it is not separable from the undelivered item, then the Company also defers the cost of the delivered item. The deferred costs are amortized on a straight-line basis over the managed services period, or over the recognition period of the undelivered item. Revenue associated with these capitalized costs is deferred and is recognized over the same period. Deferred revenue represents billings to customers for licenses and services for which revenue has not been recognized. Deferred revenue that is expected to be recognized beyond the next 12 months is considered long-term deferred revenue. Unbilled accounts receivable include all revenue amounts that had not been billed as of the balance sheet date due to contractual or other arrangements with customers. Unbilled accounts receivable that are expected to be billed beyond the next 12 months are considered long-term unbilled receivables.
Cost of License and Cost of Service	*Cost of License and Cost of Service* Cost of license and cost of service consist of all costs associated with providing software licenses and services to customers, including identified losses on contracts. Estimated losses on contracts accounted for using the percentage of completion method of accounting are recognized in the period in which the loss is identified. Cost of license includes license fees and royalty payments to software suppliers. Cost of service also includes costs of third-party products associated with reselling third-party computer hardware and software products to customers and other third-party services, when the related revenue is recorded at the gross amount. Customers purchasing third-party products and services from the Company generally do so in conjunction with the purchase of the Company’s software and services.
Research and Development	*Research and Development* Research and development expenditures consist of costs incurred in the development of new software modules and product offerings, either as part of the Company’s internal product development programs, which are sold, leased or otherwise marketed. Research and development costs are expensed as incurred. Based on the Company’s product development process, technological feasibility is established upon completion of a detailed program design or, in the absence thereof, completion of a working model. Costs incurred by the Company after achieving technological feasibility and before the product is ready for customer release have been insignificant.
Equity-Based Compensation	*Equity-Based Compensation* The Company measures and recognizes the compensation expense for all equity-based payments to employees and directors based on their estimated fair values. The Company estimates the fair value of employee stock options at the date of grant using a Black-Scholes valuation model and values restricted stock based on the market value of the underlying shares at the date of grant. The Company recognizes compensation costs using the graded vesting attribution method that results in an accelerated recognition of compensation costs in comparison to the straight-line method. The Company uses a combination of implied volatility of the Company’s traded options and historical stock price volatility (“blended volatility”) as the expected volatility assumption required in the Black-Scholes option valuation model. As equity-based compensation expense recognized in the Company’s consolidated statements of income is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures.
Concentrations of Credit Risk	*Concentrations of Credit Risk* Financial instruments that potentially subject the Company to concentration of credit risk consist principally of cash and cash equivalents, short-term interest-bearing investments, and trade receivables. Cash and cash equivalents are maintained with several financial institutions. Generally, these deposits may be redeemed upon demand and are maintained with financial institutions with reputable credit and therefore bear minimal credit risk. The Company seeks to mitigate its credit risks by spreading such risks across multiple financial institutions and monitoring the risk profiles of these counterparties. The Company has conservative investment policy guidelines under which it invests its excess cash primarily in highly liquid U.S. dollar-denominated securities. The Company’s revenue is generated primarily in North America. To a lesser extent, revenue is generated in Europe, the Asia-Pacific region and Latin America. Most of the Company’s customers are among the largest communications and directory publishing companies in the world (or are owned by them). The Company’s business is subject to the effects of general global economic conditions and market conditions in the communications industry. The Company performs ongoing credit analyses of its customer base and generally does not require collateral. The Company evaluates accounts receivable to determine if they will ultimately be collected. Significant judgments and estimates are involved in performing this evaluation, which are based on factors that may affect a customer’s ability to pay, such as past experience, credit quality of the customer, age of the receivable balance and current economic conditions. The allowance for doubtful accounts is for estimated losses resulting from accounts receivable for which their collection is not reasonably probable. As of September 30, 2013, the Company had one customer with an account receivable balance of more than 10% of total accounts receivable, amounting to 25%, which was lower than its respective portion of total revenue. As of September 30, 2012, the Company had two customers with accounts receivable balances of 10% or more of total accounts receivable, aggregating 28%, which was lower than their aggregate portion of total revenue.
Earnings per Share	*Earnings per Share* Basic earnings per share is calculated using the weighted average number of shares outstanding during the period. Diluted earnings per share is computed on the basis of the weighted average number of shares outstanding, the effect of dilutive outstanding equity-based awards using the treasury stock method and the effect of dilutive outstanding convertible notes using the if-converted method.
Derivatives and Hedging	*Derivatives and Hedging* The Company carries out transactions involving foreign currency exchange derivative financial instruments. The transactions are designed to hedge the Company’s exposure in currencies other than the U.S. dollar. The Company recognizes derivative instruments as either assets or liabilities and measures those instruments at fair value. If a derivative meets the definition of a cash flow hedge and is so designated, changes in the fair value of the derivative are recognized in other comprehensive income (loss) until the hedged item is recognized in earnings. The ineffective portion of a derivative designated as a cash flow hedge is recognized in earnings. If a derivative does not meet the definition of a cash flow hedge, the changes in the fair value are included in earnings.
Recent Accounting Standards	*Recent Accounting Standards* In July 2013, the Financial Accounting Standards Board, or FASB, issued an accounting standard update, under which an entity must present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, in the absence of certain conditions. This accounting standard update will be effective for the Company on October 1, 2014, and may result in changes in the Company’s financial statements presentation but will not affect the substantive content of the Company’s consolidated financial statements. In February 2013, the FASB issued an accounting standard update to require reclassification adjustments from other comprehensive income to be presented either in the financial statements or in the notes to the financial statements. This accounting standard update became effective for the Company in the first quarter of fiscal 2014 and will result in additional disclosures in the Company’s financial statements but will not affect the substantive content of the Company’s consolidated financial statements.
Adoption of New Accounting Standards	*Adoption of New Accounting Standards* In September 2011, the FASB issued a revised accounting standard update intended to simplify how an entity tests goodwill for impairment. The amendment allows an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity no longer is required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. This accounting standard update became effective for the Company in the first quarter of fiscal 2013, and its adoption did not have any impact on the result of the Company’s annual goodwill impairment test or its consolidated financial statements. In June 2011, the FASB issued guidance to require an entity to present the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements, thus eliminating the option to present the components of other comprehensive income as part of the statement of equity. The Company adopted this guidance in the first quarter of fiscal 2013 by including the required disclosures in two separate but consecutive statements.

Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Fair value measurement on Company's assets and liabilities

The following tables present the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2013 and 2012:


	As of September 30, 2013
	Level 1		Level 2		Total
Available-for-sale securities:
Money market funds	$	565,216	$	—	$	565,216
U.S. government treasuries		198,164		—		198,164
Corporate bonds		—		81,727		81,727
U.S. agency securities		—		25,529		25,529
Commercial paper and certificates of deposit		6,189		3,901		10,090
Government-guaranteed debt		—		6,846		6,846
Supranational and sovereign debt		—		6,311		6,311
Mortgages (including agencies and corporate)		—		879		879

Total available-for-sale securities		769,569		125,193		894,762

Derivative financial instruments, net		—		7,538		7,538

Total	$	769,569	$	132,731	$	902,300


	As of September 30, 2012
	Level 1		Level 2			Total
Available-for-sale securities:
Money market funds	$	485,012	$	—		$	485,012
U.S. government treasuries		93,387		—			93,387
Corporate bonds		—		60,923			60,923
U.S. agency securities		—		27,756			27,756
Commercial paper and certificates of deposit		6,155		1,501			7,656
Government-guaranteed debt		—		32,689			32,689
Supranational and sovereign debt		—		11,644			11,644
Mortgages (including agencies and corporate)		—		5,134			5,134
Asset backed obligations		—		3,417			3,417

Total available-for-sale securities		584,554		143,064			727,618

Derivative financial instruments, net		—		(23,928	)		(23,928	)

Total	$	584,554	$	119,136		$	703,690

Available-For-Sale Securities (Tables)

12 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Interest-bearing investments in available-for-sale securities

Available-for-sale securities consist of the following interest-bearing investments:


	As of September 30, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market funds	$	565,216	$	—	$	—	$	565,216
U.S. government treasuries		198,031		133		—		198,164
Corporate bonds		81,599		223		95		81,727
U.S. agency securities		25,529		—		—		25,529
Commercial paper and certificates of deposit		10,090		—		—		10,090
Government-guaranteed debt		6,766		80		—		6,846
Supranational and sovereign debt		6,318		—		7		6,311
Mortgages (including agencies and corporate)		958		—		79		879

Total(1)	$	894,507	$	436	$	181	$	894,762

(1)


	As of September 30, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market funds	$	485,012	$	—	$	—	$	485,012
U.S. government treasuries		93,255		132		—		93,387
Corporate bonds		60,350		573		—		60,923
U.S. agency securities		27,637		119		—		27,756
Commercial paper and certificates of deposit		7,656		—		—		7,656
Government-guaranteed debt		32,484		205		—		32,689
Supranational and sovereign debt		11,628		16		—		11,644
Mortgages (including agencies and corporate)		5,780		—		646		5,134
Asset backed obligations		3,800		—		383		3,417

Total(2)	$	727,602	$	1,045	$	1,029	$	727,618

(2)	As of September 30, 2012, $239,019 of securities were classified as short term interest-bearing investments and $488,599 of securities were classified as cash and cash equivalents.

Available for sale securities debt maturities market value

As of September 30, 2013, the Company’s available-for-sale securities had the following maturity dates:


	Market Value
Due within one year	$	716,893
1 to 2 years		112,012
2 to 3 years		59,467
3 to 4 years		5,314
Thereafter		1,076

	$	894,762

Derivative Financial Instruments (Tables)

12 Months Ended

Sep. 30, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Notional amounts of derivative instruments


	Notional Value*
Foreign exchange contracts	$	850,665

(*)	Gross notional amounts do not quantify risk or represent assets or liabilities of the Company, but are used in the calculation of settlements under the contracts.

Fair value of the open foreign currency exchange contracts

The fair value of the open foreign exchange contracts recorded by the Company on its consolidated balance sheets as of September 30, 2013 and September 30, 2012, as an asset or a liability is as follows:


	As of
	September 30,
	2013			2012
*Derivatives designated as hedging instruments*
Prepaid expenses and other current assets	$	21,595		$	855
Other noncurrent assets		3,134			1,453
Accrued expenses and other current liabilities		(11,641	)		(20,087	)
Other noncurrent liabilities		(5,567	)		(4,166	)

		7,521			(21,945	)
*Derivatives not designated as hedging instruments*
Prepaid expenses and other current assets		2,688			1,507
Accrued expenses and other current liabilities		(2,671	)		(3,490	)

		17			(1,983	)

Net fair value	$	7,538		$	(23,928	)

Effect of cash flow hedging instruments


	Gains (Losses) Reclassified from Other Comprehensive Income (Loss) (Effective Portion) Year Ended September 30,
	2013			2012			2011
Line item in statements of income:
Revenue	$	(66	)	$	3,091		$	(2,410	)
Cost of service		(2,945	)		(21,504	)		11,244
Research and development		803			(2,928	)		2,477
Selling, general and administrative		661			(3,395	)		2,220

Total	$	(1,547	)	$	(24,736	)	$	13,531

Changes in net unrealized gains (losses) on cash flow hedges

The activity related to the changes in net unrealized gains (losses) on cash flow hedges recorded in accumulated other comprehensive income (loss), net of tax, is as follows:


	Year Ended September 30,
	2013			2012			2011
Net unrealized (losses) gains on cash flow hedges, net of tax, beginning of period	$	(17,942	)	$	(14,437	)	$	6,002
Changes associated with hedging transactions, net of tax		20,035			(26,108	)		(8,483	)
Reclassification of losses (gains) into earnings, net of tax		2,603			22,603			(11,956	)

Net unrealized gains (losses) on cash flow hedges, net of tax, end of period	$	4,696		$	(17,942	)	$	(14,437	)

Effect of non-designated as hedging instruments


	Gains (Losses) Recognized in Income Year Ended September 30,
	2013			2012			2011
Line item in statements of income:
Revenue	$	362		$	(302	)	$	(2,060	)
Cost of service		4,666			(1,548	)		(1,301	)
Research and development		1,136			(319	)		151
Selling, general and administrative		1,276			(518	)		(254	)
Interest and other expense, net		4,145			(1,250	)		1,713
Income taxes		(1,179	)		506			(311	)

Total	$	10,406		$	(3,431	)	$	(2,062	)

Accounts Receivable, Net (Tables)

12 Months Ended

Sep. 30, 2013

Text Block [Abstract]

Accounts receivable, net

Accounts receivable, net consists of the following:


	As of September 30,
	2013			2012
Accounts receivable — billed	$	587,928		$	573,090
Accounts receivable — unbilled		110,626			130,697
Less — allowances		(20,335	)		(16,564	)

Accounts receivable, net	$	678,219		$	687,223

Equipment and Leasehold Improvements, Net (Tables)

12 Months Ended

Sep. 30, 2013

Property Plant And Equipment [Abstract]

Components of Equipment and Leasehold Improvements, Net

Components of equipment and leasehold improvements, net are:


	As of September 30,
	2013			2012
Computer equipment	$	1,020,643		$	967,381
Leasehold improvements		189,655			174,568
Furniture, fixtures and other		63,158			59,972

		1,273,456			1,201,921
Less accumulated depreciation		(997,912	)		(924,014	)

	$	275,544		$	277,907

Goodwill and Intangible Assets, Net (Tables)

12 Months Ended

Sep. 30, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Details of total goodwill

The following table presents details of the Company’s total goodwill:


As of October 1, 2011	$	1,739,732
Other		2,054

As of September 30, 2012		1,741,786
Goodwill resulting from an immaterial acquisition(1)		80,193
Other		(3,645	)

As of September 30, 2013	$	1,818,334

(1)

Details regarding total definite-lived purchased intangible assets

The following table presents details regarding the Company’s total definite-lived purchased intangible assets:


	Estimated Useful Life (in years)		Gross		Accumulated Amortization			Net
September 30, 2013
Core technology		4-8	$	408,256	$	(344,251	)	$	64,005
Customer relationships		4-15		346,707		(267,252	)		79,455
Intellectual property rights and purchased computer software		—		51,996		(51,996	)		—
Other		5-10		25,282		(14,716	)		10,566

Total			$	832,241	$	(678,215	)	$	154,026

September 30, 2012
Core technology		4-8	$	381,056	$	(332,322	)	$	48,734
Customer relationships		6-15		327,207		(245,119	)		82,088
Intellectual property rights and purchased computer software		—		51,996		(51,996	)		—
Other		2-10		23,082		(12,626	)		10,456

Total			$	783,341	$	(642,063	)	$	141,278

Amortization expense on definite-lived intangible assets


	Year Ended September 30,
	2013		2012		2011
Cost of service	$	1,609	$	1,609	$	1,609
Amortization of definite-lived purchased intangible assets		34,543		50,535		65,958

Total	$	36,152	$	52,144	$	67,567

Estimated future amortization expense

The estimated future amortization expense of definite-lived purchased intangible assets as of September 30, 2013 is as follows:


	Amount
Fiscal year:
2014	$	37,425
2015		32,668
2016		29,521
2017		25,982
2018		16,855
Thereafter		11,575

Total	$	154,026

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Other Noncurrent Assets (Tables)

12 Months Ended

Sep. 30, 2013

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other noncurrent assets

Other noncurrent assets consist of the following:


	As of September 30,
	2013		2012
Funded employee benefit costs(1)	$	165,899	$	137,299
Deferred costs(2)		38,281		71,089
Long term accounts receivable-unbilled		4,917		17,198
Prepaid expense		7,346		10,344
Other		62,726		79,986

	$	279,169	$	315,916

(1)	Primarily funding for severance pay liability in accordance with Israeli law. Please see Note 17 to the consolidated financial statements.

(2)	Please see Note 2 (revenue recognition) to the consolidated financial statements.

Income Taxes (Tables)

12 Months Ended

Sep. 30, 2013

Income Tax Disclosure [Abstract]

Provision (benefit) for income taxes

The provision (benefit) for income taxes consists of the following:


	Year Ended September 30,
	2013		2012			2011
Current	$	50,553	$	55,010		$	47,790
Deferred		12,485		(4,857	)		1,252

	$	63,038	$	50,153		$	49,042

Components of deferred tax assets and liabilities

Deferred income taxes are comprised of the following components:


	As of September 30,
	2013			2012
Deferred tax assets:
Deferred revenue	$	50,623		$	38,214
Employee compensation and benefits		75,356			74,248
Intangible assets, computer software and intellectual property		11,518			13,747
Tax credits, net capital and operating loss carryforwards		166,639			168,015
Other		40,754			37,902

Total deferred tax assets		344,890			332,126
Valuation allowances(1)		(127,202	)		(117,011	)

Total deferred tax assets, net		217,688			215,115

Deferred tax liabilities:
Anticipated withholdings on subsidiaries’ earnings		(53,095	)		(40,175	)
Intangible assets, computer software and intellectual property		(109,354	)		(101,583	)
Other		(34,990	)		(28,131	)

Total deferred tax liabilities		(197,439	)		(169,889	)

Net deferred tax assets	$	20,249		$	45,226

(1)	Subsequent releases of the valuation allowances, if any, will be recognized through earnings.

Effective income tax rate varied from the statutory Guernsey tax rate

The effective income tax rate varied from the statutory Guernsey tax rate as follows:


	Year Ended September 30,
	2013			2012			2011
Statutory Guernsey tax rate		0	%		0	%		0	%
Foreign taxes(2)		13			11			12

Effective income tax rate		13	%		11	%		12	%

(2)	In fiscal 2013, foreign taxes include a benefit of $29,786 attributable to the expiration during fiscal 2013 of the statutes of limitations related to unrecognized tax benefits accumulated over several years in certain jurisdictions.

Aggregate changes in balance of Company's gross unrecognized tax benefits

The aggregate changes in the balance of the Company’s gross unrecognized tax benefits were as follows:


	Year Ended September 30,
	2013			2012			2011
Balance at beginning of fiscal year	$	133,874		$	132,861		$	118,662
Additions based on tax positions related to the current year		19,527			20,183			19,849
Additions for tax positions of prior years		10,750			4,918			3,548
Reductions for tax positions of prior years		—			(5,527	)		—
Settlements with tax authorities		(3,994	)		(3,290	)		(5,231	)
Lapse of statute of limitations		(29,786	)		(15,271	)		(3,967	)

Balance at end of fiscal year	$	130,371		$	133,874		$	132,861

Other Noncurrent Liabilities (Tables)

12 Months Ended

Sep. 30, 2013

Other Liabilities Disclosure [Abstract]

Other noncurrent liabilities

Other noncurrent liabilities consists of the following:


	As of September 30,
	2013		2012
Accrued employees costs(1)	$	210,335	$	180,563
Noncurrent deferred revenue		22,641		30,988
Accrued pension liability(2)		16,189		21,373
Other		11,644		11,744

	$	260,809	$	244,668

(1)	Primarily severance pay liability in accordance with Israeli law. Please see Note 17 to the consolidated financial statements.

(2)	Primarily relates to funded status of non-contributory defined benefit plans. Please see Note 17 to the consolidated financial statements.

Interest and Other Expense, Net (Tables)

12 Months Ended

Sep. 30, 2013

Other Income And Expenses [Abstract]

Interest and other expense, net

Interest and other expense, net, consists of the following:


	Year Ended September 30,
	2013			2012			2011
Interest income	$	(4,915	)	$	(5,478	)	$	(6,180	)
Interest expense		3,557			3,175			2,882
Foreign exchange loss		4,279			7,378			9,737
Gain on sale of investments(1)		—			(9,172	)		—
Other, net		3,154			5,045			2,218

	$	6,075		$	948		$	8,657

(1)	Includes primarily a gain of $6,270 on the sale of remaining minority interest in Longshine Information Technology Company Ltd.

Contingencies (Tables)

12 Months Ended

Sep. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Future minimum non-cancelable lease payments

Future minimum non-cancelable lease payments based on the Company’s contractual obligations as of September 30, 2013 are as follows:


For the year ended September 30,
2014	$	63,797
2015		46,730
2016		42,454
2017		34,833
2018		30,140
Thereafter		66,257

	$	284,211

Stock Option and Incentive Plan (Tables)

12 Months Ended

Sep. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of option activity

The following table summarizes information about options to purchase the Company’s ordinary shares, as well as changes during the fiscal year ended September 30, 2013:


	Number of Share Options			Weighted Average Exercise Price
Outstanding as of October 1, 2012		17,654		$	29.27
Granted		2,821			35.02
Exercised		(7,243	)		29.47
Forfeited		(1,094	)		30.44

Outstanding as of September 30, 2013(1)		12,138		$	30.38

Exercisable as of September 30, 2013(1)		5,045		$	29.53

(1)	At September 30, 2013, the weighted average remaining contractual life of outstanding and exercisable options was 6.93 and 4.96 years, respectively.

Summary of restricted shares activity

The following table summarizes information relating to awards of restricted shares, as well as changes during the fiscal year ended September 30, 2013:


	Number of Shares			Weighted Average Grant Date Fair Value
Outstanding as of October 1, 2012		1,673		$	28.36
Granted		928			34.82
Vested		(613	)		27.89
Forfeited		(193	)		30.65

Outstanding as of September 30, 2013		1,795		$	31.61

Stock options outstanding

The following table summarizes information about stock options outstanding as of September 30, 2013:


Outstanding							Exercisable
Exercise Price	Number Outstanding		Weighted Average Remaining Contractual Life (in Years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$ 0.38 — 26.34		660		4.03	$	19.21		654	$	19.15
26.38 — 26.88		1,587		6.39		26.56		666		26.53
27.12 — 28.66		2,378		7.15		28.48		915		28.35
28.70 — 29.44		2,700		7.81		29.29		775		29.23
29.72 — 34.96		2,365		5.76		33.25		1,430		33.48
35.45 — 35.69		1,774		8.42		35.65		310		35.45
35.70 — 39.60		674		6.91		37.44		295		38.35

Employee equity-based compensation pre-tax expense

Employee equity-based compensation pre-tax expense for the years ended September 30, 2013, 2012 and 2011 was as follows:


	Year Ended September 30,
	2013		2012		2011
Cost of service	$	18,284	$	22,641	$	14,641
Research and development		3,805		4,320		2,701
Selling, general and administrative		18,251		16,468		19,289

Total	$	40,340	$	43,429	$	36,631

Assumptions used in calculating fair value of options


	Year Ended September 30,
	2013			2012			2011
Risk-free interest rate(1)		0.74	%		0.70	%		1.50	%
Expected life of stock options(2)		4.50			4.50			4.50
Expected volatility(3)		22.7	%		28.5	%		30.5	%
Expected dividend yield(4)		1.48	%		0.02	%		None
Fair value per option	$	5.74		$	7.18		$	7.76

(1)	Risk-free interest rate is based upon U.S. Treasury yield curve appropriate for the term of the Company’s employee stock options.

(2)	Expected life of stock options is based upon historical experience.

(3)	Expected volatility is based on blended volatility. Please see Note 2 to the consolidated financial statements.

(4)	Expected dividend yield is based on the Company’s history and future expectation of dividend payouts.

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Dividends (Tables)

12 Months Ended

Sep. 30, 2013

Text Block [Abstract]

Summary of dividends declared by board of directors

The Company’s board of directors declared the following dividends during the fiscal year ended September 30, 2013:


Declaration Date	Dividends Per Ordinary Share		Record Date	Total Amount		Payment Date
November 6, 2012	$	0.13	December 31, 2012	$	21,032	January 18, 2013
January 30, 2013	$	0.13	March 28, 2013	$	20,927	April 19, 2013
April 30, 2013	$	0.13	June 28, 2013	$	20,929	July 19, 2013
July 31, 2013	$	0.13	September 30, 2013	$	20,812	October 18, 2013

Earnings Per Share (Tables)

12 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

The following table sets forth the computation of basic and diluted earnings per share:


	Year Ended September 30,
	2013		2012		2011
Numerator:
Numerator for basic and diluted earnings per share	$	412,439	$	391,371	$	346,665

Denominator:
Denominator for basic earnings per share — weighted average number of shares outstanding		161,330		168,275		185,213
Effect of assumed conversion of 0.50% convertible notes		24		24		24
Effect of dilutive stock options granted		1,764		1,138		1,322

Denominator for dilutive earnings per share — adjusted weighted average shares and assumed conversions		163,118		169,437		186,559

Basic earnings per share	$	2.56	$	2.33	$	1.87

Diluted earnings per share	$	2.53	$	2.31	$	1.86

Segment Information and Sales to Significant Customers (Tables)

12 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Summary of revenue and long-lived assets by geographic area

The following is a summary of revenue and long-lived assets by geographic area. Revenue is attributed to geographic region based on the location of the customers.


	Year Ended September 30,
	2013		2012		2011
Revenue
North America (Mainly United States)	$	2,423,067	$	2,266,110	$	2,333,096
Europe		398,400		441,731		403,115
Rest of the world		524,387		539,062		441,517

Total	$	3,345,854	$	3,246,903	$	3,177,728


	As of September 30,
	2013		2012		2011
Long-lived Assets(1)
North America (Mainly United States)	$	72,855	$	83,645	$	102,739
Europe		78,501		65,746		47,717
Rest of the world:
Israel		56,683		51,086		45,669
India		25,036		29,401		35,071
Others		42,469		48,029		27,206

Total	$	275,544	$	277,907	$	258,402

(1)	Includes equipment and leasehold improvements.

Revenue and customer information

Customer experience systems also include a comprehensive line of services such as consulting, systems integration and transformation, testing, information technology outsourcing (ITO) and value process operation, managed services and product support, system implementation, integration, modification, consolidation, modernization, ongoing support, enhancement and maintenance. Directory includes comprehensive set of products and services for local marketing service providers and search and directory publishers.


	Year Ended September 30,
	2013		2012		2011
Customer experience systems	$	3,185,637	$	3,066,170	$	2,978,288
Directory		160,217		180,733		199,440

Total	$	3,345,854	$	3,246,903	$	3,177,728

Summary of the percentage of sales to significant customers groups

The following table summarizes the percentage of sales to significant customer groups (when they amount to at least 10 percent of total revenue for the year).


	Year Ended September 30,
	2013			2012			2011
Customer 1		28	%		26	%		29	%
Customer 2		*			10			11
Customer 3		*			*			10

*	Represents an amount of less than 10%.

Unaudited Quarterly Results of Operations (Tables)

12 Months Ended

Sep. 30, 2013

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Results of Operations

The following are details of the unaudited quarterly results of operations for the three months ended:


	September 30,		June 30,		March 31,		December 31,
2013
Revenue	$	845,225	$	841,332	$	832,938	$	826,359
Operating income		122,876		123,164		122,855		112,657
Net income		88,954		119,558		104,912		99,015
Basic earnings per share		0.55		0.74		0.65		0.61
Diluted earnings per share		0.54		0.73		0.64		0.61
2012
Revenue	$	822,128	$	808,837	$	808,928	$	807,010
Operating income		113,501		110,051		109,872		109,048
Net income		98,021		98,749		101,870		92,731
Basic earnings per share		0.60		0.59		0.60		0.54
Diluted earnings per share		0.60		0.59		0.60		0.53

Nature of Entity - Additional Information (Detail)	12 Months Ended
Nature of Entity - Additional Information (Detail)	Sep. 30, 2013 Segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of operating segment	1

Summary of Significant Accounting Policies - Additional Information (Detail) - Customer	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Statutory Accounting Practices [Line Items]
Cash and cash equivalents maximum maturity period	90 days
Minimum likelihood of tax benefits being realized upon ultimate settlement	50.00%
Percentage of revenue to major customer	10.00%
Revenue from third-party sales	Less than 10%	Less than 10%	Less than 10%
Number of customers with an account receivable balance of more than 10% of total accounts receivable	1	2
Aggregate account receivable of 10% or more of total accounts receivable	25.00%	28.00%
Concentration of credit risk, accounts receivable	As of September 30, 2013, the Company had one customer with an account receivable balance of more than 10% of total accounts receivable, amounting to 25%, which was lower than its respective portion of total revenue.	As of September 30, 2012, the Company had two customers with accounts receivable balances of 10% or more of total accounts receivable, aggregating 28%, which was lower than their aggregate portion of total revenue.
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Statutory Accounting Practices [Line Items]
Percentage threshold for concentration of credit risk, accounts receivable disclosure	10.00%	10.00%
Minimum [Member]
Statutory Accounting Practices [Line Items]
Estimated useful life of assets	3 years
Maximum [Member]
Statutory Accounting Practices [Line Items]
Estimated useful life of assets	10 years

Acquisitions - Additional Information (Detail) $ in Thousands	Sep. 30, 2013 USD ($)
Actix [Member]
Business Acquisition [Line Items]
Business acquisition	$ 112,405

Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012	Sep. 10, 2012
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	$ 894,762	$ 727,618
Derivative financial instruments, net	7,538	(23,928)
Total	902,300	703,690
Money market funds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	565,216	485,012
U.S. government treasuries [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	198,164	93,387
Corporate bonds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	81,727	60,923
U.S. agency securities [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	25,529	27,756
Commercial paper and certificates of deposit [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	10,090		$ 7,656
Government guaranteed debt [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	6,846	32,689
Supranational and sovereign debt [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	6,311	11,644
Mortgages (including agencies and corporate) [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	879	5,134
Asset backed obligations [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments		3,417
Level 1 [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	769,569	584,554
Derivative financial instruments, net
Total	769,569	584,554
Level 1 [Member] \| Money market funds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	565,216	485,012
Level 1 [Member] \| U.S. government treasuries [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	198,164	93,387
Level 1 [Member] \| Corporate bonds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments
Level 1 [Member] \| U.S. agency securities [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments
Level 1 [Member] \| Commercial paper and certificates of deposit [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	6,189		6,155
Level 1 [Member] \| Government guaranteed debt [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments
Level 1 [Member] \| Supranational and sovereign debt [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments
Level 1 [Member] \| Mortgages (including agencies and corporate) [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments
Level 1 [Member] \| Asset backed obligations [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments
Level 2 [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	125,193	143,064
Derivative financial instruments, net	7,538	(23,928)
Total	132,731	119,136
Level 2 [Member] \| Money market funds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments
Level 2 [Member] \| U.S. government treasuries [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments
Level 2 [Member] \| Corporate bonds [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	81,727	60,923
Level 2 [Member] \| U.S. agency securities [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	25,529	27,756
Level 2 [Member] \| Commercial paper and certificates of deposit [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	3,901		$ 1,501
Level 2 [Member] \| Government guaranteed debt [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	6,846	32,689
Level 2 [Member] \| Supranational and sovereign debt [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	6,311	11,644
Level 2 [Member] \| Mortgages (including agencies and corporate) [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments	$ 879	5,134
Level 2 [Member] \| Asset backed obligations [Member]
Available-for-sale securities:
Fair value, Measured on recurring basis, Investments		$ 3,417

Available-For-Sale Securities - Interest-bearing Investments in Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 894,507	$ 727,602
Gross Unrealized Gains	436	1,045
Gross Unrealized Losses	181	1,029
Fair Value	894,762	727,618
Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	565,216	485,012
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	565,216	485,012
U.S. government treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	198,031	93,255
Gross Unrealized Gains	133	132
Gross Unrealized Losses
Fair Value	198,164	93,387
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	81,599	60,350
Gross Unrealized Gains	223	573
Gross Unrealized Losses	95
Fair Value	81,727	60,923
U.S. agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,529	27,637
Gross Unrealized Gains		119
Gross Unrealized Losses
Fair Value	25,529	27,756
Commercial paper and certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,090	7,656
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	10,090	7,656
Government guaranteed debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,766	32,484
Gross Unrealized Gains	80	205
Gross Unrealized Losses
Fair Value	6,846	32,689
Supranational and sovereign debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,318	11,628
Gross Unrealized Gains		16
Gross Unrealized Losses	7
Fair Value	6,311	11,644
Mortgages (including agencies and corporate) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	958	5,780
Gross Unrealized Gains
Gross Unrealized Losses	79	646
Fair Value	$ 879	5,134
Asset backed obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,800
Gross Unrealized Gains
Gross Unrealized Losses		383
Fair Value		$ 3,417

Available-For-Sale Securities - Interest-bearing Investments in Available-For-Sale Securities (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	$ 312,188	$ 239,019
Maturity period of short term interest-bearing securities included in cash and cash equivalents	longer than 90 days
Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	$ 582,574	$ 488,599
Maturity period of short term interest-bearing securities included in cash and cash equivalents	90 days or less

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15C
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15E
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Available-For-Sale Securities - Available-for-Sale Securities Debt Maturities Market Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012
Available For Sale Securities Debt Maturities Fair Value [Abstract]
Due within one year	$ 716,893
1 to 2 years	112,012
2 to 3 years	59,467
3 to 4 years	5,314
Thereafter	1,076
Fair Value	$ 894,762	$ 727,618

- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
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-Section 50
-Paragraph 2
-Subparagraph (b)-(g)
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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-Name Statement of Financial Accounting Standard (FAS)
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-Subparagraph b
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
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-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Maximum amount of loss due to credit risk	$ 20,702
Maximum length of time hedged in cash flow hedge	2 years
Maximum maturity period of significant portion of forward and option contracts outstanding	12 months
Typical maturity period of other risk management derivatives	Less than 12 months
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) from cash flow hedges recognized in other comprehensive income (loss), net of taxes	$ 28,504	$ (30,730)	$ (8,497)
Gains (losses) from cash flow hedges recognized in other comprehensive income (loss)	20,035	$ (26,108)	$ (8,483)
Foreign currency cash flow hedge, reclassified into earnings during fiscal year 2014	$ 6,870

- Definition

Before tax amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

+ Details

- Definition

Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 220
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-Paragraph 10A
-Subparagraph (d)
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-Number 130
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Derivative Financial Instruments - Notional Amounts of Derivative Instruments (Detail) $ in Thousands	Sep. 30, 2013 USD ($)
Notional Amount Of Derivatives Total [Abstract]
Foreign exchange contracts	$ 850,665

Derivative Financial Instruments - Fair Value of the Open Foreign Currency Exchange Contracts (Detail) - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012
Derivatives, Fair Value [Line Items]
Net fair value	$ 7,538	$ (23,928)
Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Net fair value	7,521	(21,945)
Derivatives not designated as hedging instruments [member]
Derivatives, Fair Value [Line Items]
Net fair value	17	(1,983)
Prepaid expenses and other current assets [Member] \| Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	21,595	855
Prepaid expenses and other current assets [Member] \| Derivatives not designated as hedging instruments [member]
Derivatives, Fair Value [Line Items]
Derivative Asset	2,688	1,507
Other noncurrent assets [Member] \| Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	3,134	1,453
Accrued expenses and other current liabilities [Member] \| Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(11,641)	(20,087)
Accrued expenses and other current liabilities [Member] \| Derivatives not designated as hedging instruments [member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(2,671)	(3,490)
Other noncurrent liabilities [Member] \| Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	$ (5,567)	$ (4,166)

Derivative Financial Instruments - Effect of Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Effect of cash flow hedging instruments	$ (1,547)	$ (24,736)	$ 13,531
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effect of cash flow hedging instruments	(66)	3,091	(2,410)
Cost of service [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effect of cash flow hedging instruments	(2,945)	(21,504)	11,244
Research and development [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effect of cash flow hedging instruments	803	(2,928)	2,477
Selling, general and administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effect of cash flow hedging instruments	$ 661	$ (3,395)	$ 2,220

Derivative Financial Instruments - Changes in Net Unrealized Gains (Losses) on Cash Flow Hedges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized (losses) gains on cash flow hedges, net of tax, beginning of period	$ (17,942)	$ (14,437)
Net unrealized gains (losses) on cash flow hedges, net of tax, end of period	4,696	(17,942)	$ (14,437)
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized (losses) gains on cash flow hedges, net of tax, beginning of period	(17,942)	(14,437)	6,002
Changes associated with hedging transactions, net of tax	20,035	(26,108)	(8,483)
Reclassification of losses (gains) into earnings, net of tax	2,603	22,603	(11,956)
Net unrealized gains (losses) on cash flow hedges, net of tax, end of period	$ 4,696	$ (17,942)	$ (14,437)

- Definition

+ References + Details

- Definition

Net of tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 220
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
-Number 51
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Derivative Financial Instruments - Effect of Non-Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency derivative instruments not designated as hedging instruments	$ 10,406	$ (3,431)	$ (2,062)
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency derivative instruments not designated as hedging instruments	362	(302)	(2,060)
Cost of service [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency derivative instruments not designated as hedging instruments	4,666	(1,548)	(1,301)
Research and development [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency derivative instruments not designated as hedging instruments	1,136	(319)	151
Selling, general and administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency derivative instruments not designated as hedging instruments	1,276	(518)	(254)
Interest and other expense, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency derivative instruments not designated as hedging instruments	4,145	(1,250)	1,713
Income taxes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency derivative instruments not designated as hedging instruments	$ (1,179)	$ 506	$ (311)

Accounts Receivable, Net - Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012
Receivables [Abstract]
Accounts receivable - billed	$ 587,928	$ 573,090
Accounts receivable - unbilled	110,626	130,697
Less - allowances	(20,335)	(16,564)
Accounts receivable, net	$ 678,219	$ 687,223

Equipment and Leasehold Improvements, Net - Components of Equipment and Leasehold Improvements, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 1,273,456	$ 1,201,921
Less accumulated depreciation	(997,912)	(924,014)
Equipment and leasehold improvements, net	275,544	277,907	$ 258,402
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	1,020,643	967,381
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	189,655	174,568
Furniture, fixtures and other [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 63,158	$ 59,972

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References + Details

Equipment and Leasehold Improvements, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Property Plant And Equipment [Abstract]
Depreciation expense	$ 104,624	$ 107,470	$ 113,910
Unamortized software assets	$ 68,255	$ 57,960

Goodwill and Intangible Assets, Net - Details of Total Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, Beginning Balance	$ 1,741,786	$ 1,739,732
Goodwill resulting from an immaterial acquisition	80,193
Other	(3,645)	2,054
Goodwill, Ending Balance	$ 1,818,334	$ 1,741,786

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 43
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill and Intangible Assets, Net - Details of Total Goodwill (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Goodwill [Line Items]
Goodwill resulting from immaterial acquisition	$ 80,193
Value of intangible asset	154,026	$ 141,278
Actix [Member]
Goodwill [Line Items]
Goodwill resulting from immaterial acquisition	80,193
Research and development [Member] \| Actix [Member]
Goodwill [Line Items]
In-process research and development	2,700
Core technology [Member]
Goodwill [Line Items]
Value of intangible asset	64,005	48,734
Core technology [Member] \| Actix [Member]
Goodwill [Line Items]
Value of intangible asset	$ 27,200
Useful life of intangible assets	4 years
Customer relationships [Member]
Goodwill [Line Items]
Value of intangible asset	$ 79,455	82,088
Customer relationships [Member] \| Actix [Member]
Goodwill [Line Items]
Value of intangible asset	$ 19,500
Useful life of intangible assets	4 years
Other [Member]
Goodwill [Line Items]
Value of intangible asset	$ 10,566	$ 10,456
Other [Member] \| Actix [Member]
Goodwill [Line Items]
Value of intangible asset	$ 2,200
Useful life of intangible assets	5 years

Goodwill and Intangible Assets, Net - Details Regarding Total Definite-Lived Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Gross	$ 832,241	$ 783,341
Accumulated Amortization	(678,215)	(642,063)
Total	154,026	141,278
Core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	408,256	381,056
Accumulated Amortization	(344,251)	(332,322)
Total	$ 64,005	$ 48,734
Core technology [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	4 years	4 years
Core technology [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	8 years	8 years
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 346,707	$ 327,207
Accumulated Amortization	(267,252)	(245,119)
Total	$ 79,455	$ 82,088
Customer relationships [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	4 years	6 years
Customer relationships [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	15 years	15 years
Intellectual property rights and purchased computer software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 51,996	$ 51,996
Accumulated Amortization	(51,996)	(51,996)
Total
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	25,282	23,082
Accumulated Amortization	(14,716)	(12,626)
Total	$ 10,566	$ 10,456
Other [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	5 years	2 years
Other [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years	10 years

Goodwill and Intangible Assets, Net - Amortization Expense on Definite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Goodwill And Intangible Assets Disclosure [Abstract]
Cost of service	$ 1,609	$ 1,609	$ 1,609
Amortization of definite-lived purchased intangible assets	34,543	50,535	65,958
Total	$ 36,152	$ 52,144	$ 67,567

Goodwill and Intangible Assets, Net - Additional Information (Detail) $ in Thousands	12 Months Ended
	Sep. 30, 2013 USD ($) Segment	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Impairment of goodwill \| $	$ 0	$ 0	$ 0
Number of operating segments \| Segment	1

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 47
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill and Intangible Assets, Net - Estimated Future Amortization Expense (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
2014	$ 37,425
2015	32,668
2016	29,521
2017	25,982
2018	16,855
Thereafter	11,575
Total	$ 154,026	$ 141,278

Other Noncurrent Assets - Other Noncurrent Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Funded employee benefit costs	$ 165,899	$ 137,299
Deferred costs	38,281	71,089
Long term accounts receivable-unbilled	4,917	17,198
Prepaid expense	7,346	10,344
Other	62,726	79,986
Other noncurrent assets	$ 279,169	$ 315,916

Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Current	$ 50,553	$ 55,010	$ 47,790
Deferred	12,485	(4,857)	1,252
Income taxes	$ 63,038	$ 50,153	$ 49,042

- Definition

The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Tax Disclosure [Abstract]
Deferred income tax expenses as a result of enacted changes in tax laws or rates	$ 14,671
Corporate tax rate of the company	0.00%	0.00%	0.00%
Net increase (decrease) in valuation allowances	$ 10,191	$ (20,825)
Tax credits, net capital and operating loss carryforwards	547,875	540,945
Tax credits, net capital and operating loss carryforwards having expiration date	$ 173,864	$ 162,844
Tax credits, net capital and operating loss carryforwards expiration date	Through 2033 for $173,864 in net operating losses	Through 2032 for $162,844 in net operating losses
Gross unrecognized tax benefits	$ 130,371	$ 133,874	$ 132,861	$ 118,662
Accrued income taxes payable for interest and penalties relating to unrecognized tax benefits	19,126	18,704
Accrued income taxes payable recognized in the statement of income	422	$ 731
Expected decrease in unrecognized tax benefits within next 12 months	$ 18,385

Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012
Deferred tax assets:
Deferred revenue	$ 50,623	$ 38,214
Employee compensation and benefits	75,356	74,248
Intangible assets, computer software and intellectual property	11,518	13,747
Tax credits, net capital and operating loss carryforwards	166,639	168,015
Other	40,754	37,902
Total deferred tax assets	344,890	332,126
Valuation allowances	(127,202)	(117,011)
Total deferred tax assets, net	217,688	215,115
Deferred tax liabilities:
Anticipated withholdings on subsidiaries' earnings	(53,095)	(40,175)
Intangible assets, computer software and intellectual property	(109,354)	(101,583)
Other	(34,990)	(28,131)
Total deferred tax liabilities	(197,439)	(169,889)
Net deferred tax assets	$ 20,249	$ 45,226

Income Taxes - Effective Income Tax Rate Varied from the Statutory Guernsey Tax Rate (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Statutory Guernsey tax rate (percentage)	0.00%	0.00%	0.00%
Foreign taxes (percentage)	13.00%	11.00%	12.00%
Effective income tax rate	13.00%	11.00%	12.00%

Income Taxes - Effective Income Tax Rate Varied from the Statutory Guernsey Tax Rate (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Lapse of statute of limitations	$ 29,786	$ 15,271	$ 3,967

Income Taxes - Aggregate Changes in Balance of Company's Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Beginning balance	$ 133,874	$ 132,861	$ 118,662
Additions based on tax positions related to the current year	19,527	20,183	19,849
Additions for tax positions of prior years	10,750	4,918	3,548
Reduction for tax positions of prior years		(5,527)
Settlements with tax authorities	(3,994)	(3,290)	(5,231)
Lapse of statute of limitations	(29,786)	(15,271)	(3,967)
Unrecognized tax benefits, Ending balance	$ 130,371	$ 133,874	$ 132,861

Repurchase of Shares - Additional Information (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2013 USD ($) $ / shares shares
Equity [Abstract]
Repurchase of outstanding ordinary shares	Since April 2010, the Company's board of directors has adopted share repurchase plans authorizing the repurchase of the Company's outstanding ordinary shares.
Share repurchase program, Authorized amount	$ 500,000
Repurchase of shares, Shares \| shares	10,370
Average price at which ordinary shares are repurchased \| $ / shares	$ 35.38
Remaining authority to repurchase outstanding ordinary shares	$ 335,866

Financing Arrangements - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended				12 Months Ended
	Oct. 31, 2013	Sep. 30, 2013	Oct. 31, 2012	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Line of Credit Facility [Line Items]
Five-year revolving credit facility								$ 500,000
Borrowings under the revolving credit facility		$ 200,000		$ 200,000
Payments under financing arrangements			$ 200,000		$ 200,000	$ 250,000	$ 200,000
Outstanding letters of credit and bank guarantees					$ 64,331
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Payments under financing arrangements	$ 200,000

Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012
Other Liabilities Disclosure [Abstract]
Accrued employees costs	$ 210,335	$ 180,563
Noncurrent deferred revenue	22,641	30,988
Accrued pension liability	16,189	21,373
Other	11,644	11,744
Other noncurrent liabilities	$ 260,809	$ 244,668

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References + Details

- Definition

This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
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-Paragraph 1
-Subparagraph (SX 210.5-02.24)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Interest and Other Expense, Net - Interest and Other Expense, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Other Income And Expenses [Abstract]
Interest income	$ (4,915)	$ (5,478)	$ (6,180)
Interest expense	3,557	3,175	2,882
Foreign exchange loss	4,279	7,378	9,737
Gain on sale of investments		(9,172)
Other, net	3,154	5,045	2,218
Total	$ 6,075	$ 948	$ 8,657

- Definition

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

+ References + Details

Interest and Other Expense, Net - Interest and Other Expense, Net (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Sep. 30, 2013 USD ($)
Longshine Information Technology Ltd. [Member]
Schedule Of Interest Expenses [Line Items]
Gain on the sale of remaining minority interest	$ 6,270

Contingencies - Future Minimum Non-Cancellable Lease Payments (Detail) - Office Space [Member] $ in Thousands	Sep. 30, 2013 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014	$ 63,797
2015	46,730
2016	42,454
2017	34,833
2018	30,140
Thereafter	66,257
Total	$ 284,211

Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Commitments And Contingencies Disclosure [Abstract]
Committed future sublease income, 2014	$ 2,245
Committed future sublease income, 2015	1,310
Committed future sublease income, 2016	725
Committed future sublease income, 2017	306
Committed future sublease income, 2018	317
Rent expense, net of sublease income	$ 45,610	$ 41,488	$ 40,104
Product warranty, limited warranty period offered	90 days

Employee Benefits - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Compensation And Retirement Disclosure [Abstract]
Severance expenses	$ 22,326	$ 24,611	$ 28,054
Excess percentage of net actuarial gain (loss)	The excess of the net actuarial gain (loss) over 10% of the greater of the benefit obligation and the market-related value of plan assets is amortized over the average remaining service period of active employees.

- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
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-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5-8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 146
-Paragraph 8-13, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS146-1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 112
-Paragraph 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Stock Option and Incentive Plan - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Maximum number of shares authorized to be granted	62,300
Stock option awards, vesting period	4 years
Stock option awards, term	10 years
Total intrinsic value of options exercised	$ 44,604	$ 22,929	$ 19,394
Value of restricted shares vested	20,891	15,594	12,376
Aggregate intrinsic value of stock options outstanding	76,647
Aggregate intrinsic value of stock options exercisable	36,404
Total income tax benefit recognized for stock-based compensation	4,150	$ 6,254	$ 2,350
Unrecognized compensation expense related to unvested stock options and unvested restricted stock awards	$ 35,746
Unrecognized compensation expense weighted average period of recognition	1 year

Stock Option and Incentive Plan - Summary of Option Activity (Detail) shares in Thousands	12 Months Ended
	Sep. 30, 2013 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Outstanding, Beginning Balance \| shares	17,654
Number of Options, Granted \| shares	2,821
Number of Option, Exercised \| shares	(7,243)
Number of Options, Forfeited \| shares	(1,094)
Number of Options, Outstanding, Ending Balance \| shares	12,138
Number of Options, Exercisable \| shares	5,045
Weighted Average Exercise Price, Outstanding, Beginning Balance \| $ / shares	$ 29.27
Weighted Average Exercise Price, Granted \| $ / shares	35.02
Weighted Average Exercise Price, Exercised \| $ / shares	29.47
Weighted Average Exercise Price, Forfeited \| $ / shares	30.44
Weighted Average Exercise Price, Outstanding, Ending Balance \| $ / shares	30.38
Weighted Average Exercise Price, Outstanding, Exercisable \| $ / shares	$ 29.53

Stock Option and Incentive Plan - Summary of Option Activity (Parenthetical) (Detail)	12 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted average remaining contractual life of outstanding options	6 years 11 months 5 days
Weighted average remaining contractual life of exercisable options	4 years 11 months 16 days

Stock Option and Incentive Plan - Summary of Restricted Shares Activity (Detail) shares in Thousands	12 Months Ended
	Sep. 30, 2013 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Restricted Stock, Beginning Balance \| shares	1,673
Number of Restricted Stock, Granted \| shares	928
Number of Restricted Stock, Vested \| shares	(613)
Number of Restricted Stock, Forfeited \| shares	(193)
Number of Restricted Stock, Ending Balance \| shares	1,795
Restricted stock, Weighted Average Grant Date Fair Value, Beginning Balance \| $ / shares	$ 28.36
Restricted stock, Weighted Average Grant Date Fair Value, Granted \| $ / shares	34.82
Restricted stock, Weighted Average Grant Date Fair Value, Vested \| $ / shares	27.89
Restricted stock, Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	30.65
Restricted stock, Weighted Average Grant Date Fair Value, Ending Balance \| $ / shares	$ 31.61

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References + Details

Stock Option and Incentive Plan - Stock Options Outstanding (Detail) shares in Thousands	12 Months Ended
	Sep. 30, 2013 $ / shares shares
Exercise Price Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Range	$ 0.38
Exercise Price, Upper Range	$ 26.34
Number of options outstanding \| shares	660
Weighted Average Remaining Contractual Life (in Years)	4 years 11 days
Weighted Average Exercise Price, Outstanding	$ 19.21
Number of Options, Exercisable \| shares	654
Weighted Average Exercise Price, Exercisable	$ 19.15
Exercise Price Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Range	26.38
Exercise Price, Upper Range	$ 26.88
Number of options outstanding \| shares	1,587
Weighted Average Remaining Contractual Life (in Years)	6 years 4 months 21 days
Weighted Average Exercise Price, Outstanding	$ 26.56
Number of Options, Exercisable \| shares	666
Weighted Average Exercise Price, Exercisable	$ 26.53
Exercise Price Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Range	27.12
Exercise Price, Upper Range	$ 28.66
Number of options outstanding \| shares	2,378
Weighted Average Remaining Contractual Life (in Years)	7 years 1 month 24 days
Weighted Average Exercise Price, Outstanding	$ 28.48
Number of Options, Exercisable \| shares	915
Weighted Average Exercise Price, Exercisable	$ 28.35
Exercise Price Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Range	28.70
Exercise Price, Upper Range	$ 29.44
Number of options outstanding \| shares	2,700
Weighted Average Remaining Contractual Life (in Years)	7 years 9 months 22 days
Weighted Average Exercise Price, Outstanding	$ 29.29
Number of Options, Exercisable \| shares	775
Weighted Average Exercise Price, Exercisable	$ 29.23
Exercise Price Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Range	29.72
Exercise Price, Upper Range	$ 34.96
Number of options outstanding \| shares	2,365
Weighted Average Remaining Contractual Life (in Years)	5 years 9 months 4 days
Weighted Average Exercise Price, Outstanding	$ 33.25
Number of Options, Exercisable \| shares	1,430
Weighted Average Exercise Price, Exercisable	$ 33.48
Exercise Price Range Six [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Range	35.45
Exercise Price, Upper Range	$ 35.69
Number of options outstanding \| shares	1,774
Weighted Average Remaining Contractual Life (in Years)	8 years 5 months 1 day
Weighted Average Exercise Price, Outstanding	$ 35.65
Number of Options, Exercisable \| shares	310
Weighted Average Exercise Price, Exercisable	$ 35.45
Exercise Price Range Seven [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Range	35.70
Exercise Price, Upper Range	$ 39.60
Number of options outstanding \| shares	674
Weighted Average Remaining Contractual Life (in Years)	6 years 10 months 28 days
Weighted Average Exercise Price, Outstanding	$ 37.44
Number of Options, Exercisable \| shares	295
Weighted Average Exercise Price, Exercisable	$ 38.35

Stock Option and Incentive Plan - Employee Equity-Based Compensation Pre-Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 40,340	$ 43,429	$ 36,631
Cost of service [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	18,284	22,641	14,641
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	3,805	4,320	2,701
Selling, general and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 18,251	$ 16,468	$ 19,289

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Stock Option and Incentive Plan - Assumptions Used in Calculating Fair Value of Options (Detail) - $ / shares	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free interest rate	0.74%	0.70%	1.50%
Expected life of stock options	4 years 6 months	4 years 6 months	4 years 6 months
Expected volatility	22.70%	28.50%	30.50%
Expected dividend yield	1.48%	0.02%
Fair value per option	$ 5.74	$ 7.18	$ 7.76

Dividends - Board of Directors Declared Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended				12 Months Ended
	Jul. 31, 2013	Apr. 30, 2013	Jan. 30, 2013	Nov. 06, 2012	Sep. 30, 2013	Sep. 30, 2012
Dividends Payable [Line Items]
Dividends Per Ordinary Share					$ 0.52	$ 0.13
Declaration Date, November 6, 2012 [Member]
Dividends Payable [Line Items]
Declaration Date					Nov. 06, 2012
Record Date					Dec. 31, 2012
Payment Date					Jan. 18, 2013
Dividends Per Ordinary Share				$ 0.13
Total Amount				$ 21,032
Declaration Date, January 30, 2013 [Member]
Dividends Payable [Line Items]
Declaration Date					Jan. 30, 2013
Record Date					Mar. 28, 2013
Payment Date					Apr. 19, 2013
Dividends Per Ordinary Share			$ 0.13
Total Amount			$ 20,927
Declaration Date, April 30, 2013 [Member]
Dividends Payable [Line Items]
Declaration Date					Apr. 30, 2013
Record Date					Jun. 28, 2013
Payment Date					Jul. 19, 2013
Dividends Per Ordinary Share		$ 0.13
Total Amount		$ 20,929
Declaration Date, July 31, 2013 [Member]
Dividends Payable [Line Items]
Declaration Date					Jul. 31, 2013
Record Date					Sep. 30, 2013
Payment Date					Oct. 18, 2013
Dividends Per Ordinary Share	$ 0.13
Total Amount	$ 20,812

Dividends - Additional Information (Detail) - Subsequent Event [Member]	1 Months Ended
	Nov. 05, 2013 $ / shares
First Installment [Member]
Dividends Payable [Line Items]
Dividends payable date declared	Nov. 05, 2013
Quarterly dividend payment per share	$ 0.13
Record Date	Dec. 31, 2013
Cash dividend payable date	Jan. 17, 2014
Second Installment [Member]
Dividends Payable [Line Items]
Cash dividend payable date	Apr. 17, 2014
Increase in the rate of quarterly cash dividend	$ 0.155

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Numerator
Numerator for basic and diluted earnings per share	$ 88,954	$ 119,558	$ 104,912	$ 99,015	$ 98,021	$ 98,749	$ 101,870	$ 92,731	$ 412,439	$ 391,371	$ 346,665
Denominator
Denominator for basic earnings per share - weighted average number of shares outstanding									161,330	168,275	185,213
Effect of assumed conversion of 0.50% convertible notes									24	24	24
Effect of dilutive stock options granted									1,764	1,138	1,322
Denominator for dilutive earnings per share - adjusted weighted average shares and assumed conversions									163,118	169,437	186,559
Basic earnings per share	$ 0.55	$ 0.74	$ 0.65	$ 0.61	$ 0.60	$ 0.59	$ 0.60	$ 0.54	$ 2.56	$ 2.33	$ 1.87
Diluted earnings per share	$ 0.54	$ 0.73	$ 0.64	$ 0.61	$ 0.60	$ 0.59	$ 0.60	$ 0.53	$ 2.53	$ 2.31	$ 1.86

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 5

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Interest rate on convertible senior notes	0.50%	0.50%	0.50%

Earnings Per Share - Additional Information (Detail) - shares shares in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Weighted average number of shares attributable to antidilutive outstanding stock options not included in the calculation of diluted earnings per share	3,005	12,313	14,970

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Information and Sales to Significant Customers - Summary of Revenue and Long-lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 845,225	$ 841,332	$ 832,938	$ 826,359	$ 822,128	$ 808,837	$ 808,928	$ 807,010	$ 3,345,854	$ 3,246,903	$ 3,177,728
Total long-lived assets	275,544				277,907				275,544	277,907	258,402
North America (Mainly United States) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									2,423,067	2,266,110	2,333,096
Total long-lived assets	72,855				83,645				72,855	83,645	102,739
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									398,400	441,731	403,115
Total long-lived assets	78,501				65,746				78,501	65,746	47,717
Rest of the World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									524,387	539,062	441,517
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	56,683				51,086				56,683	51,086	45,669
India [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	25,036				29,401				25,036	29,401	35,071
Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 42,469				$ 48,029				$ 42,469	$ 48,029	$ 27,206

Segment Information and Sales to Significant Customers - Revenue and Customer Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Revenue from External Customer [Line Items]
Total revenue	$ 845,225	$ 841,332	$ 832,938	$ 826,359	$ 822,128	$ 808,837	$ 808,928	$ 807,010	$ 3,345,854	$ 3,246,903	$ 3,177,728
Customer experience systems [Member]
Revenue from External Customer [Line Items]
Total revenue									3,185,637	3,066,170	2,978,288
Directory [Member]
Revenue from External Customer [Line Items]
Total revenue									$ 160,217	$ 180,733	$ 199,440

Segment Information and Sales to Significant Customers - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting [Abstract]
Minimum percentage of sales to significant customer groups	10.00%	10.00%	10.00%

Segment Information and Sales to Significant Customers - Summary of the Percentage of Sales to Significant Customer Groups (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Customer 1 [Member]
Revenue, Major Customer [Line Items]
Percentage of sales to significant customer groups	28.00%	26.00%	29.00%
Customer 2 [Member]
Revenue, Major Customer [Line Items]
Percentage of sales to significant customer groups		10.00%	11.00%
Customer 3 [Member]
Revenue, Major Customer [Line Items]
Percentage of sales to significant customer groups			10.00%

Selected Quarterly Results of Operations - Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 845,225	$ 841,332	$ 832,938	$ 826,359	$ 822,128	$ 808,837	$ 808,928	$ 807,010	$ 3,345,854	$ 3,246,903	$ 3,177,728
Operating income	122,876	123,164	122,855	112,657	113,501	110,051	109,872	109,048	481,552	442,472	404,364
Net income	$ 88,954	$ 119,558	$ 104,912	$ 99,015	$ 98,021	$ 98,749	$ 101,870	$ 92,731	$ 412,439	$ 391,371	$ 346,665
Basic earnings per share	$ 0.55	$ 0.74	$ 0.65	$ 0.61	$ 0.60	$ 0.59	$ 0.60	$ 0.54	$ 2.56	$ 2.33	$ 1.87
Diluted earnings per share	$ 0.54	$ 0.73	$ 0.64	$ 0.61	$ 0.60	$ 0.59	$ 0.60	$ 0.53	$ 2.53	$ 2.31	$ 1.86

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

+ Details

- Definition

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Subsequent Event - Additional Information (Detail) $ in Thousands	Nov. 05, 2013 USD ($)
Subsequent Event [Member] \| Celcite [Member]
Subsequent Event [Line Items]
Business acquisition price	$ 129,000

Schedule - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Accounts Receivable Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 16,564	$ 15,566	$ 11,428
Charged to costs and expenses	5,851	4,498	7,602
Charged to other accounts	1,176	1,659	3,620
Deductions	(3,256)	(5,159)	(7,084)
Ending Balance	20,335	16,564	15,566
Valuation Allowances on Net Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	117,011	137,836	106,743
Charged to costs and expenses	23,199	23,708	24,372
Charged to other accounts	2,552		16,685
Deductions	(15,560)	(44,533)	(9,964)
Ending Balance	$ 127,202	$ 117,011	$ 137,836

Schedule - Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowances for accounts receivable acquired		$ 640	$ 1,488
Valuation allowances on deferred tax assets written off against the deferred tax assets		$ 38,268	$ 4,060
Valuation allowances on deferred tax assets written off against the deferred tax assets	$ 7,707
Series of Individually Immaterial Business Acquisitions [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowances for accounts receivable acquired	$ 109