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Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag] Cybersecurity Risk Board of Directors Oversight [Text Block] Statement [Table] Statement [Table] Net actuarial gain (loss) on defined benefit plan Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent, Total Net actuarial gain on defined benefit plan Accrued Expenses and Other Current Liabilities [Member] Accrued Expenses And Other Current Liabilities [Member] Accrued expenses and other current liabilities. Lease assets obtained in exchange for liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Entity Phone Fax Numbers, Phone Fax Number Type [Axis] Entity Phone Fax Numbers, Phone Fax Number Type [Axis] Fair value per option Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Payments to Acquire Businesses, Gross Business acquisition, Cash Paid Statement [Line Items] Statement [Line Items] Repurchase of shares Treasury Stock, Value, Acquired, Cost Method Business Acquisition, Acquiree [Domain] Business Combination [Domain] Entity Filer Category Entity Filer Category Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Maximum amount of loss due to credit risk Maximum Amount Of Loss Due To Credit Risk The value of maximum amount of loss due to credit risk. Total liabilities and equity Liabilities and Equity Derivative Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral, Total Accrued Expenses and Other Current Liabilities Accrued Expenses and Other Current Liabilities [Abstract] Payables and Accruals [Abstract] Weighted Average Exercise Price, Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Restructuring Type [Axis] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Severance expenses Severance Costs Phone Fax Number Type [Domain] Phone Fax Number Type [Domain] Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Net Increase (Decrease) in valuation allowances Prepaid Expenses and Other Current Assets [Member] Prepaid Expenses and Other Current Assets [Member] O 2025 A Dividends [Member] O 2025 A Dividends [Member] Cybersecurity Risk Third Party Oversight and Identification Processes [Flag] Quarterly Financial Information Disclosure [Abstract] Restructuring and Related Costs [Table Text Block] Restructuring Activities Valuation allowances Deferred Tax Assets, Valuation Allowance Proceeds From Sale Of Equity Investments And Other Amount of cash inflow from the sale of investments classified as equity investments and other Net cash from equity investments and other Dividend Declaration Date February Six Two Thousand Twenty Four [Member] Dividend Declaration Date February Six Two Thousand Twenty Four [Member] Declaration Date, February 6, 2024 [Member] Statutory Guernsey tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Shares Issued, Price Per Share Purchase price per ordinary share Subsequent Event [Line Items] Cybersecurity Risk Management Third Party Engaged [Flag] Goodwill Goodwill, Beginning Balance Goodwill, Ending Balance Goodwill Goodwill, Total Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Interest income Investment Income, Interest Interest income Fair Value of Open Foreign Currency Exchange Contracts Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] Total Accounts receivable — unbilled Unbilled Contracts Receivable Geographical [Domain] Geographical [Domain] O2021M2 Dividends [Member] O2021M2 Dividends [Member] Dividends Declaration Date November 2, 2021 [Member] Asset Backed Obligations [Member] Asset-Backed Securities [Member] O2024M2 Dividends [Member] O2024M2 Dividends [Member] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Summary of Reconciliation of Operating Profit (Loss) from Segments Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Expected decrease in unrecognized tax benefits within next 12 months due to lapse of statutes of limitations Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Underlying Asset Class [Domain] Foreign tax benefit from internal structural changes Income Tax Reconciliation Foreign Tax Benefit From Internal Structural Changes Income tax reconciliation foreign tax benefit from internal structural changes. Debt issue cost Debt Issuance Costs, Net Debt Issuance Costs, Net, Total Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Property and Equipment, Net [Line Items] Property, Plant and Equipment [Line Items] Useful life of intangible assets Finite-Lived Intangible Asset, Useful Life Concentration Risk [Table] Concentration Risk [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Stock options granted Number of Share Options, Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Disaggregation of Revenue [Table] Share Repurchase Program August Two Thousand Twenty Three Plan [Member] Share Repurchase Program August Two Thousand Twenty Three Plan [Member] Share Repurchase Program August 2023 Member Cybersecurity Risk Management, Strategy, and Governance [Table] Business divestiture pre-tax gain Proceeds From Sale Of Open Market Proceeds From Sale Of Open Market Unrecognized deferred tax liability for undistributed earnings of foreign subsidiary due to indefinitely reinvestment Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Tax credits, net capital and operating loss carryforwards Tax Credits Net Capital And Operating Loss Carryforwards The sum of tax credits, net capital and operating loss carryforwards available to reduce future tax liabilities. Charged to costs and expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Dividends payable amount increase per share Dividends Payable Amount Increase Per Share Dividends Payable Amount Increase Per Share Total Amount Dividends Payable Available-for-Sale Securities Debt Maturities Market Value Investments Classified by Contractual Maturity Date [Table Text Block] Basic earnings per share Earnings Per Share, Basic Earnings Per Share, Basic, Total Basic earnings per ordinary share attributable to Amdocs Limited Revenue by Nature of Activities Disaggregation of Revenue [Table Text Block] Standard Product Warranty Accrual Standard Product Warranty Accrual, Ending Balance Standard Product Warranty Accrual, Beginning Balance Standard Product Warranty Accrual, Total Accrued product warranty liability Employee Benefits Retirement Benefits [Text Block] Document Shell Company Report Document Shell Company Report Number of Share Options, Outstanding, Beginning Balance Number of Share Options, Outstanding, Ending Balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Interest-Bearing Investments in Available-for-Sale Securities Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Disclosure of Supplemental Cash Flow Information Related to Operating Leases [Table] Disclosure Of Supplemental Cash Flow Information Related To Operating Leases [Table] Disclosure Of Supplemental Cash Flow Information Related To Operating Leases [Table]. Revolving Credit Facility [Member] Revolving Credit Facility [Member] Total current liabilities Liabilities, Current Accounts receivable, net Increase (Decrease) in Accounts Receivable Reconciliation of net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year Five 2030 Hedging Designation [Domain] Hedging Designation [Domain] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Record Date Dividends Payable, Date of Record Share Repurchase Program [Domain] Share Repurchase Program [Domain] Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction One customer with more than 10 percent One customer with more than 10 percent One customer with more than 10 percent Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale, Total Proceeds from sale of available-for-sale securities Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Reductions for tax positions of prior years Reductions for tax positions of prior years O2022M4 Dividends [Member] O2022M2 Dividends [Member] Dividends Declaration Date November 8, 2022 [Member] Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Amdocs Limited Shareholders' equity: Equity, Attributable to Parent [Abstract] Notional Amounts of Derivative Instruments Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Hedging Designation [Axis] Hedging Designation [Axis] Declaration Date, November 8, 2022 [Member] Dividend Declaration Date November Eight Two Thousand Twenty Two [Member] Dividend Declaration Date November Eight Two Thousand Twenty Two [Member] Retained earnings Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Total Description of business entity acquisitions Business Combination, Description of Acquiree Nature of Entity Nature of Operations [Text Block] Geographic Concentration Risk [Member] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Number of Share Options, Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Total intrinsic value of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Interest and Other Expense, Net [Member] Interest Expense Income [Member] Interest expense income. 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