Cover page Document Information [Table] Document Information [Table] Document Information [Line Items] Document Information [Line Items] Amendment Flag Amendment Flag Entity Address, Postal Zip Code Entity Address, Postal Zip Code Contact Personnel Email Address Contact Personnel Email Address Contact Personnel Name Contact Personnel Name Document Period End Date Document Period End Date Entity Central Index Key Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity Current Reporting Status City Area Code City Area Code Document Annual Report Document Annual Report Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Address, Country Entity Address Country Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity File Number Document Accounting Standard Entity Registrant Name Entity Registrant Name ICFR Auditor Attestation Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Address, State or Province Entity Address, State or Province Document Transition Report Document Transition Report Document Type Document Type Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, City or Town Entity Address, City or Town Entity Emerging Growth Company Entity Emerging Growth Company Entity Filer Category Entity Filer Category Entity Interactive Data Current Entity Interactive Data Current Local Phone Number Local Phone Number Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Shell Company Entity Shell Company Document Registration Statement Document Registration Statement Document Shell Company Report Document Shell Company Report Title of 12(b) Security Security 12(b) Title Entity Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis] Address Type [Domain] Address Type [Domain] Business Contact [Member] Entity Phone Fax Numbers, Phone Fax Number Type [Axis] Entity Phone Fax Numbers, Phone Fax Number Type [Axis] Phone Fax Number Type [Domain] Phone Fax Number Type [Domain] Contact Phone [Member] Contact Phone [Member] Statement of Financial Position [Abstract] Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets: Debt Securities, Available-for-sale, Current Short-term interest-bearing investments Accounts Receivable, after Allowance for Credit Loss, Current, Total Accounts receivable, net Assets, Current Total current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets Total assets Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Total long-lived assets Goodwill Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Other Assets, Noncurrent Other noncurrent assets Operating Lease, Right-of-Use Asset Lease assets Liabilities and Equity [Abstract] LIABILITIES AND EQUITY Liabilities Total liabilities Liabilities and Equity Total liabilities and equity Operating Lease, Liability, Noncurrent Lease liabilities Deferred Income Taxes and Other Tax Liabilities, Noncurrent Deferred income taxes and taxes payable Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Expenses And Other Current Liabilities Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Carrying value as of the balance sheet date of short-term obligations incurred and payable, pertaining to costs incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Short-term Debt Short-term financing arrangements Short-term borrowing Operating Lease, Liability, Current Lease liabilities Contract with Customer, Liability, Current Deferred revenue Employee-related Liabilities, Current Accrued personnel costs Liabilities, Current Total current liabilities Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interests Other Liabilities, Noncurrent Other noncurrent liabilities Stockholders' Equity Attributable to Parent [Abstract] Amdocs Limited Shareholders' equity: Retained Earnings (Accumulated Deficit) Retained earnings Common Stock, Value, Issued Ordinary Shares — Authorized 700,000 shares; £0.01 par value; 281,945 and 279,578 issued and 124,866 and 131,535 outstanding, in 2021 and 2020, respectively Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Additional Paid in Capital Additional paid-in capital Preferred Stock, Value, Issued Preferred Shares — Authorized 25,000 shares; £0.01 par value; 0 shares issued and outstanding Stockholders' Equity Attributable to Parent Total Amdocs Limited shareholders' equity Treasury Stock, Value Treasury stock, at cost — 157,079 and 148,043 ordinary shares in 2021 and 2020, respectively Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total equity Balance Balance Long-term Debt, Excluding Current Maturities Long-term debt, net of unamortized debt issuance costs Treasury Stock, Shares Treasury stock, at cost, ordinary shares Preferred Stock, Shares Issued Preferred Shares, issued Preferred Stock, Shares Outstanding Preferred Shares, outstanding Common Stock, Par or Stated Value Per Share Ordinary Shares, par value Common Stock, Shares Authorized Ordinary Shares, authorized Common Stock, Shares, Issued Ordinary Shares, issued Common Stock, Shares, Outstanding Ordinary Shares, outstanding Balance, Shares Balance, Shares Preferred Stock, Par or Stated Value Per Share Preferred Shares, par value Preferred Stock, Shares Authorized Preferred Shares, authorized Income Statement [Abstract] Operating Income (Loss) Operating income Operating income Net Income (Loss) Attributable to Parent Net income Net income Net income Nonoperating Income (Expense) Interest and other expense, net Total Operating Expenses [Abstract] Operating expenses: Operating Costs and Expenses Total operating expenses Selling, General and Administrative Expense Selling, general and administrative Research and Development Expense, Software (Excluding Acquired in Process Cost) Research and development Amortization of Intangible Assets Amortization of purchased intangible assets and other Cost of Revenue Cost of revenue Gain (Loss) on Disposition of Business Gain from sale of a business Gain from sale of a business Revenues Revenue Total revenue Earnings Per Share, Basic Basic earnings per share Basic earnings per common share Earnings Per Share, Diluted Diluted earnings per share Diluted earnings per common share Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before income taxes Income Tax Expense (Benefit) Income taxes Income taxes Statement of Comprehensive Income [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive (loss) income, net of tax: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Net change in fair value of available-for-sale securities Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Net actuarial gain (loss) on defined benefit plan Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent Net change in fair value of cash flow hedges Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive (loss) income, net of tax Other comprehensive income (loss), net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income Comprehensive income Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent Tax (expense) benefit on unrealized gain (loss) on defined benefit plan Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent Tax benefit (expense) on change in fair value of cash flow hedges Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-in Capital [Member] Additional Paid-in Capital Parent [Member] Total Amdocs Limited Shareholders' Equity Retained Earnings [Member] Retained Earnings AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) Treasury Stock [Member] Treasury Stock Common Stock Outstanding [Member] Ordinary Shares Common Stock Outstanding [Member] Noncontrolling Interest [Member] Non-controlling Interests Statement [Line Items] Statement [Line Items] APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Equity-based compensation expense related to employees Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Employee stock options exercised, Shares Number of Share Options, Exercised Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock, net of forfeitures Stock Issued During Period, Value, Stock Options Exercised Employee stock options exercised Treasury Stock, Shares, Acquired Repurchase of shares, Shares Repurchase of shares, Shares Treasury Stock, Value, Acquired, Cost Method Repurchase of shares Noncontrolling Interest, Period Increase (Decrease) Changes in Noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive income: Dividends, Common Stock, Cash Cash dividends declared Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock, net of forfeitures, Shares Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption, Adjustment [Member] Cumulative Effect Adjustment AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax Unrealized loss on short-term interest-bearing investments, net of tax Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Unrealized gain on derivatives, net of tax Net unrealized gain (loss) on cash flow hedges, net of tax, beginning of period Net unrealized gain (loss) on cash flow hedges, net of tax, end of period Common Stock, Dividends, Per Share, Declared Cash dividends declared per ordinary share Dividends Per Ordinary Share Increase in Retained Earnings Increase in retained earnings Increase in retained earnings. Decrease in Retained Earnings Decrease in retained earnings Decrease in retained earnings. Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Unrealized loss on defined benefit plan, net of tax Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2014-09 [Member] Accounting Standards Update 2014-09 [Member] Accounting Standards Update [Member] Accounting Standards Update 2016-16 [Member] Accounting Standards Update Statement of Cash Flows [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net (decrease) increase in cash and cash equivalents Net Cash Provided by (Used in) Financing Activities [Abstract] Cash Flow from Financing Activities: Payments of Dividends Payments of dividends Net Cash Provided by (Used in) Financing Activities Net cash (used in) provided by financing activities Payment for Contingent Consideration Liability, Financing Activities Payment of contingent consideration from a business acquisition Payments for Repurchase of Common Stock Repurchase of shares Proceeds from Issuance of Long-term Debt Proceeds from issuance of debt, net Proceeds from Lines of Credit Borrowings under financing arrangements Proceeds from (Payments to) Noncontrolling Interests Investment by noncontrolling interests, net Proceeds from Stock Options Exercised Proceeds from employee stock option exercises Repayments of Lines of Credit Payments under financing arrangements Proceeds from (Payments for) Other Financing Activities Other Net Cash Provided by (Used in) Operating Activities [Abstract] Cash Flow from Operating Activities: Increase (Decrease) in Operating Capital [Abstract] Net changes in operating assets and liabilities, net of amounts acquired: Increase (Decrease) in Accounts Receivable Accounts receivable, net Increase (Decrease) in Contract with Customer, Liability Deferred revenue Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable, accrued expenses and accrued personnel Increase (Decrease) in Other Noncurrent Assets Other noncurrent assets Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Income taxes payable, net Increase (Decrease) in Other Noncurrent Liabilities Other noncurrent liabilities Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Increase Decrease In Lease Assets And Liabilities Lease assets and liabilities, net Increase decrease in lease assets and liabilities. Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Reconciliation of net income to net cash provided by operating activities: Debt Securities, Available-for-sale, Realized Gain (Loss) Loss from short-term interest-bearing investments Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred Depreciation, Depletion and Amortization Depreciation and amortization Amortization of Debt Issuance Costs Amortization of debt issuance cost Share-based Payment Arrangement, Noncash Expense, Total Equity-based compensation expense Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Supplemental Cash Flow Information [Abstract] Interest and Income Taxes Paid Cash Paid For [Abstract] Cash paid for: Cash paid for. Income Taxes Paid, Net Income taxes, net of refunds Interest Paid, Excluding Capitalized Interest, Operating Activities Interest Net Cash Provided by (Used in) Investing Activities [Abstract] Cash Flow from Investing Activities: Payments for (Proceeds from) Other Investing Activities Other Payments for (Proceeds from) Productive Assets Purchase of property and equipment, net Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Proceeds from Sale of Debt Securities, Available-for-sale Proceeds from sale of short-term interest-bearing investments Net Cash Received From Sale Of Business Net cash received from sale of a business Net cash received from sale of a business. Payments to Acquire Debt Securities, Available-for-sale Purchase of short-term interest-bearing investments