Document and Company Information [Abstract] Document and Company Information [Abstract] Document And Company Information. ASSETS ASSETS Current assets: Assets, Current [Abstract] Total assets Assets Goodwill Goodwill, Beginning Balance Goodwill, Ending Balance Goodwill Deferred income taxes Deferred income taxes Deferred Tax Assets, Net, Noncurrent Total current assets Assets, Current Accounts receivable, net Accounts Receivable, Net, Current, Total Accounts Receivable, Net, Current Prepaid expenses and other current assets Prepaid expenses and other current assets Prepaid expenses and other current assets. Deferred income taxes and taxes receivable Deferred income taxes and taxes receivable The current portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carry forwards, shall be classified according to the expected reversal date of the t emporary difference. Additionally, it includes carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of dispute. Equipment and leasehold improvements, net Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Stockholders' Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Shareholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Total liabilities Total liabilities Liabilities Noncurrent liabilities and other Noncurrent liabilities and other Other Liabilities, Noncurrent Convertible notes Convertible Notes Payable, Noncurrent Total current liabilities Total current liabilities Liabilities, Current Total current assets Prepaid expenses and other current assets Deferred revenue Deferred Revenue, Current, Total Deferred Revenue, Current Accrued expenses, other current liabilities and other Accrued expenses and other current liabilities Accrued expenses and other current liabilities. Total liabilities and shareholders' equity Liabilities and Stockholders' Equity Retained earnings Retained earnings Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost - 37,387 and 36,920 Ordinary Shares in 2009 and 2008, respectively Treasury stock, at cost ? 37,387 and 36,920 Ordinary Shares in 2009 and 2008, respectively Treasury Stock, Value, Ending Balance Treasury Stock, Value Ordinary Shares - Authorized 700,000 and 550,000 shares; GBP 0.01par value; 242,466 and 240,836 issued and 205,079 and 203,916 outstanding, in 2009 and 2008, respectively Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued Preferred Shares - Authorized 25,000 shares; GBP 0.01par value; 0 shares issued and outstanding Preferred Stock, Value, Issued, Total Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Cash and Cash Equivalents, at Carrying Value Treasury stock at cost, ordinary shares Treasury Stock, Shares, Beginning Balance Treasury Stock, Shares, Ending Balance Treasury Stock, Shares Ordinary Shares, outstanding Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding Ordinary Shares, issued Common Stock, Shares, Issued, Total Common Stock, Shares, Issued Ordinary Shares, authorized Common Stock, Shares Authorized Ordinary Shares, par value (in GBP) Common Stock, Par or Stated Value Per Share Preferred Shares, outstanding Preferred Stock, Shares Outstanding, Beginning Balance Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding Preferred Shares, issued Preferred Stock, Shares Issued, Total Preferred Stock, Shares Issued Preferred Shares, authorized Preferred Stock, Shares Authorized Preferred Shares, par value (in GBP) Preferred Stock, Par or Stated Value Per Share Revenue: Revenues [Abstract] Operating expenses: Operating Expenses [Abstract] Diluted weighted average number of shares outstanding Diluted weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Diluted Basic weighted average number of shares outstanding Basic weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Basic Diluted earnings per share Diluted earnings per share Earnings Per Share, Diluted Basic earnings per share Basic earnings per share Earnings Per Share, Basic Income taxes Income taxes Income Tax Expense (Benefit) Income before income taxes Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest Operating income Operating income Operating Income (Loss) Amortization of purchased intangible assets Amortization of purchased intangible assets Amortization of Intangible Assets Selling, general and administrative Selling, General and Administrative Expense, Total Selling, General and Administrative Expense Statements of Cash Flows [Abstract] Cash Flow from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Reconciliation of net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net changes in operating assets and liabilities, net of amounts acquired: Increase (Decrease) in Operating Capital [Abstract] Net increase in cash and cash equivalents Cash anNet increase (decrease) in cash and cash equivalentsd Cash Equivalents, Period Increase (Decrease), Total Cash and Cash Equivalents, Period Increase (Decrease) Cash Flow from Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net cash (used in) provided by financing activities Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Excess tax benefit from equity-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Supplementary Cash Flow Information Supplemental Cash Flow Information [Abstract] Proceeds from employee stock options exercised Proceeds from Stock Options Exercised Cash Flow from Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from sale of equipment, vehicles and leasehold improvements Proceeds from sale of equipment, vehicles and leasehold improvements Proceeds from Sale of Property, Plant, and Equipment Payments for purchase of equipment, vehicles and leasehold improvements Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Property, Plant, and Equipment Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Noncurrent liabilities and other Increase (Decrease) in Other Operating Liabilities Noncurrent liabilities and other Deferred revenue Increase (Decrease) in Deferred Revenue Other noncurrent assets Increase (Decrease) in Other Operating Assets Loss (gain) on sale of equipment (Gain) loss on sale of equipment Gain (Loss) on Sale of Property Plant Equipment Excess tax benefit from equity-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Deferred income taxes Deferred Income Tax Expense (Benefit), Total Deferred Income Tax Expense (Benefit) Equity-based compensation expense related to employees Share-based Compensation, Total Share-based Compensation In-process research and development expenses Research and Development in Process Nature of Entity [Abstract] Nature of Entity [Abstract] Nature of Entity. Summary of Significant Accounting Policies Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies. Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Acquisitions [Abstract] Acquisitions [Abstract] Acquisitions. Acquisitions Business Combination Disclosure [Text Block] Equipment and Leasehold Improvements, Net Property, Plant and Equipment Disclosure [Text Block] Goodwill and Intangible Assets, Net [Abstract] Goodwill and Intangible Assets, Net [Abstract] Goodwill and Intangible Assets Net. Goodwill and Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Income Taxes Income Tax Disclosure [Text Block] Financing Arrangements [Abstract] Financing Arrangements [Abstract] Financing Arrangements. Convertible Notes [Abstract] Convertible Notes [Abstract] Convertible Notes. Financing Arrangements Debt Disclosure [Text Block] Noncurrent Liabilities and Other [Abstract] Noncurrent Liabilities and Other [Abstract] Noncurrent Liabilities and Other. Noncurrent Liabilities and Other Other Liabilities Disclosure [Text Block] Contingencies [Abstract] Contingencies [Abstract] Contingencies. Contingencies Commitments and Contingencies Disclosure [Text Block] Intangible assets, net Intangible assets, net Finite-Lived Intangible Assets, Net Total shareholders' equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Accounts payable Accounts Payable, Current, Total Accounts Payable, Current Deferred income taxes and taxes payable Deferred income taxes and taxes payable Deferred income taxes and taxes payable includes the current portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A current taxable temporary difference is a difference between the tax basis and the carrying amount of a current asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or a sset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carry forwards, shall be classified according to the expected reversal date of the temporary difference. In addition, it also includes the carrying value as of the balance sheet date of obligations incurred and payable for statutory income taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Deferred income taxes and taxes payable Deferred income taxes and taxes payable Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not re lated to an asset or liability for financial reporting, including deferred tax assets related to carry forwards, shall be classified according to the expected reversal date of the temporary difference. In addition it includes the noncurrent portion of the amount recognized for uncertain tax positions. Net income Net Income (Loss) Attributable to Parent Interest and Income Taxes Paid Interest And Income Taxes Paid Abstract Interest And Income Taxes Paid. Cash paid for: Cash Paid For Abstract Cash paid for. Interest Interest Paid, Net, Total Interest Paid, Net Income taxes, net of refunds Income Taxes Paid, Net, Total Income Taxes Paid, Net Redemption of convertible notes Repayments of Convertible Debt Repurchase of shares Payments for Repurchase of Common Stock Proceeds from sale of short-term interest-bearing investments Proceeds from Sale of Available-for-sale Securities, Total Proceeds from Sale of Available-for-sale Securities Purchase of short-term interest-bearing investments Payments to Acquire Available-for-sale Securities, Total Payments to Acquire Available-for-sale Securities Accounts payable, accrued expenses and accrued personnel Accounts payable, accrued expenses and other current liabilities The net change during the reporting period in the value of this group of liabilities within the working capital section. Prepaid expenses and other current assets Increase (Decrease) in Prepaid, Deferred Expense and Other Assets, Total Increase (Decrease) in Prepaid, Deferred Expense and Other Assets Net income Equity-based compensation expense Equity-based compensation expense related to non- employee stock options Equity Based Compensation Expense Related To Non Employee Stock Options Equity-based compensation expense related to non- employee stock options. Issuance of stock options related to acquisitions, net Issuance Of Restricted stock And Stock Options Related To Acquisitions Net Issuance of restricted stock and stock options related to acquisitions, net. Issuance of restricted stock, net of forfeitures Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock, net of forfeitures, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Employee stock options exercised, shares Stock Issued During Period, Shares, Stock Options Exercised Employee stock options exercised Stock Issued During Period, Value, Stock Options Exercised Adjustment to accumulated other comprehensive income upon adoption of SFAS 158 (primarily codified in ASC 715- Compensation -Retirement Benefits) net of $(378) tax Application of Recognition Provisions of FAS 158, Effect on Accumulated Other Comprehensive Income, Net of Tax Comprehensive income Comprehensive income Comprehensive Income, Net of Tax, Attributable to Parent Unrealized gain/loss on defined benefit plan, net of tax Unrealized loss on defined benefit plan assets, net of $(489) tax Other Comprehensive Income, Defined Benefit Plans Adjustment, Net of Tax Nature of Operations [Text Block] Nature of Entity Available-For-Sale Securities Available-for-sale Securities [Text Block] Accounts Receivable, Net Accounts Receivable, Net [Abstract] Other Noncurrent Assets Schedule of Other Assets, Noncurrent [Text Block] Convertible Notes Long-term Debt [Text Block] Interest (expense) income and other, net Other Income and Other Expense Disclosure [Text Block] Employee Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Stock Option and Incentive Plan Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Text Block] Earnings Per Share Earnings Per Share [Text Block] Segment Information and Sales to Significant Customers [Abstract] Segment Information and Sales to Significant Customers [Abstract] Segment Information and Sales to Significant Customers. Operational Efficiency and Cost Reduction Programs [Abstract] Operational Efficiency and Cost Reduction Programs [Abstract] Operational Efficiency and Cost Reduction Programs. Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Selected Quarterly Results of Operations (Unaudited) [Abstract] Selected Quarterly Results of Operations (Unaudited) [Abstract] Selected Quarterly Results of Operations (Unaudited). Selected Quarterly Results of Operations (Unaudited) Quarterly Financial Information [Text Block] Accounts Receivable, Net Accounts Receivable Net Text Block Accounts Receivable, Net. Earnings Per Share [Abstract] Earnings Per Share [Abstract] Tax effect on unrealized loss on defined benefit plan Other Comprehensive Income, Defined Benefit Plans, Tax Treasury stock, at cost - 37,387 and 36,920 Ordinary Shares in 2009 and 2008, respectively Excess tax benefit from equity-based compensation Proceeds from employee stock options exercised Purchase of short-term interest-bearing investments Payments for purchase of equipment and leasehold improvements Redemption of convertible notes Repurchase of shares Deferred income taxes and taxes payable Balance Sheets Statement [Abstract] Balance Sheets [Abstract] Ordinary Shares Ordinary Shares Additional Paid-in Capital Additional Paid-in Capital Treasury Stock Treasury Stock Accumulated Comprehensive Income (Loss) Accumulated Other Comprehensive (Loss) Income Retained Earnings Retained Earnings Equity-based compensation expense related to non- employee stock options Net income Other noncurrent assets Other Assets, Noncurrent License License Revenue Aggregate license revenue, in the normal course of business, during the period after deducting allowances and discounts. Total Revenue Total Revenue Aggregate revenue, in the normal course of business, recognized during the period. Service Sales Revenue, Services, Net Restructuring charges, in-process research and development and other Restructuring Charges In Process Research And Development And Other Acquisition Related Costs Restructuring charges, in-process research and development and other acquisition-related costs Total operating expense Total Operating Expense Total operating expense Unrealized gain/loss on foreign currency hedging contracts, net of tax Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax, Total Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax Unrealized gain/loss on short-term interest-bearing investments, net of tax Unrealized Gain On Short Term Interest Bearing Investments Net Of Tax Appreciation or loss in value (after reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized gains or losses realized upon the sale of securities, after tax; and (2) the unrealized gains or losses realized upon the write-down of securities, after tax. Repurchase of shares Treasury Stock, Value, Acquired, Cost Method Repurchase of shares, shares Repurchase Of Shares Number of shares that were repurchased during the period and are being held in treasury. Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Statement [Table] Statement [Line Items] Statements of Income [Abstract] Cost of Services Nonoperating Income (Expense) Statements of Changes in Shareholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Parent [Member] Preferred Stock [Member] Capital Units [Member] Common Stock Including Additional Paid in Capital [Member] Preferred Stock Including Additional Paid in Capital [Member] Other Additional Capital [Member] Deferred Compensation, Share-based Payments [Member] Retained Earnings, Appropriated [Member] Retained Earnings, Unappropriated [Member] Undistributed Income from Other than Gain or Loss on Sale of Properties [Member] Undistributed Net Realized Gain or Loss on Sale of Properties [Member] Accumulated Distributions in Excess of Net Income [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Accumulated Translation Adjustment [Member] Accumulated Defined Benefit Plans Adjustment [Member] Noncontrolling Interest [Member] Comprehensive Income [Member] Cost of service Cost of Services, Total Interest (expense) income and other, net Short-term interest-bearing investments Available-for-sale Securities, Debt Securities, Current, Total Available-for-sale Securities, Debt Securities, Current Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued personnel costs Accrued personnel costs Cost of license Cost of license Costs incurred and are directly related to generating license revenue. Accounts receivable, net Accounts receivable, net The net change during the reporting period of amount due from customers or clients for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Income taxes payable, net Change in Income taxes payable The net change during the period in the amount of net cash payments due to taxing authorities for taxes that are based on the reporting entity's earnings. In addition it includes the net change during the period in the noncurrent portion of the amount recognized for uncertain tax positions. Deferred Income Taxes And Taxes Payable Noncurrent Change In Accounts Receivable Entity Common Stock Shares Outstanding Tax effect on unrealized gain/loss on foreign currency hedging contracts Other Comprehensive Income, Derivatives Qualifying as Hedges, Tax Effect, Total Other Comprehensive Income, Derivatives Qualifying as Hedges, Tax Effect Tax effect on unrealized gain/loss on short-term interest-bearing investments Tax Effect On Unrealized Gain Loss On Short Term Interest Bearing Investments Tax effect of appreciation or loss in value (after reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized gains or losses realized upon the sale of securities, after tax; and (2) the unrealized gains or losses realized upon the write-down of securities. Income Taxes [Abstract] Employee Benefits [Abstract] Stock Option and Incentive Plan [Abstract] Loss (gain) from short-term interest-bearing investments Loss (gain) from short-term interest-bearing investments This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as available-for-sale. Additionally, this item includes losses recognized for other than temporary impairments. Depreciation and amortization Depreciation And Amortization Expense Depreciation and amortization expense. Segment information and sales to significant customers Segment information and sales to significant customers Includes Entity-Wide disclosure about: Geographic Areas, revenues from external customers for each group of similar products and services, and Tabular disclosure about sales to significant customers group. Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Operational Efficiency and Cost Reduction Programs Restructuring and Related Activities Disclosure [Text Block] Other Noncurrent Assets [Abstract] Other Noncurrent Assets [Abstract] Other Noncurrent Assets Abstract. Comprehensive income: Comprehensive Income, Net of Tax, Attributable to Parent [Abstract]