Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Tax benefit (expense) on change in fair value of cash flow hedges	$ 2,211	$ 362	$ 2,076
Tax benefit (expense) on income loss	$ 0	$ 0	$ 0

Other comprehensive income derivative instruments derivatives designated as hedges tax attributable to parent.

No definition available.

Name:	dox_OtherComprehensiveIncomeDerivativeInstrumentsDerivativesDesignatedAsHedgesTaxAttributableToParent
Namespace Prefix:	dox_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration