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Contingencies and Commitments - Additional Information (Detail) - Long Running Legal Dispute [Member] $ in Thousands	12 Months Ended
	Sep. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Settlement payments	$ 50,000
Legal fees and other costs	$ 5,000

X

- Definition

Commitments And Contingencies Disclosure [Line Items]

+ References

No definition available.

+ Details

Name:	dox_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix:	dox_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Legal Fees And Other Associated Costs

+ References

No definition available.

+ Details

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

X

- Definition

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: