XML 97 R86.htm IDEA: XBRL DOCUMENT
v3.25.3

Income Taxes - Effective Income Tax Rate Varied from Statutory Guernsey Tax Rate (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Schedule Of Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Releases of gross unrecognized tax benefits related to settled arrangements with tax authorities, change in measurement of certain positions and expiration of periods set forth in statutes of limitations |  |  | $ 40,644
Releases of gross unrecognized tax benefits | $ 26,842 | $ 81,556 |
Tax Benefit Internal Structural Changes In Certain Jurisdictions |  |  | 11,566
Net benefit from release of unrecognized tax benefit |  | 47,770 | 16,232
Tax benefit change in measurement of deferred tax liability |  |  | 9,236
Tax benefit from creation of deferred tax asset in certain jurisdiction |  | $ 17,465 |
Tax benefit related to the release of accrued withholding taxes on unremitted earnings | $ 18,504 |  |
Benefit of relating to changes in tax regulations in certain jurisdiction |  |  | 3,142
ISRAEL |  |  |
Schedule Of Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Tax benefit related to the release of accrued withholding taxes on unremitted earnings |  |  | $ 22,700

X
- Definition Net Benefit from Release of Unrecognized Tax Benefit + References No definition available. + Details
Name: | dox_NetBenefitFromReleaseOfUnrecognizedTaxBenefit
Namespace Prefix: | dox_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Releases of Gross Unrecognized Tax Benefits + References No definition available. + Details
Name: | dox_ReleasesOfGrossUnrecognizedTaxBenefits
Namespace Prefix: | dox_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Releases of gross unrecognized tax benefits related to settled arrangements with tax authorities, change in measurement of certain positions and expiration of periods set forth in statutes of limitations + References No definition available. + Details
Name: | dox_ReleasesOfGrossUnrecognizedTaxBenefitsRelatedToSettledArrangementsWithTaxAuthoritiesChangeInMeasurementOfCertainPositionsAndExpirationOfPeriodsSetForthInStatutesOfLimitations
Namespace Prefix: | dox_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Schedule of Effective Income Tax Rate Reconciliation [Line Items] + References No definition available. + Details
Name: | dox_ScheduleOfEffectiveIncomeTaxRateReconciliationLineItems
Namespace Prefix: | dox_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Benefit Change in Measurement of Deferred Tax Liability + References No definition available. + Details
Name: | dox_TaxBenefitChangeInMeasurementOfDeferredTaxLiability
Namespace Prefix: | dox_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Benefit from Creation of Deferred Tax Asset in Certain Jurisdiction + References No definition available. + Details
Name: | dox_TaxBenefitFromCreationOfDeferredTaxAssetInCertainJurisdiction
Namespace Prefix: | dox_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Benefit Internal Structural Changes In Certain Jurisdiction + References No definition available. + Details
Name: | dox_TaxBenefitInternalStructuralChangesInCertainJurisdiction
Namespace Prefix: | dox_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-15 + Details
Name: | us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for extraterritorial income exclusion. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
Name: | us-gaap_IncomeTaxReconciliationDeductionsExtraterritorialIncomeExclusion
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_IL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |