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Schedule - Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Valuation allowances on deferred tax assets written off against the deferred tax assets	$ 2,283	$ 7,588
Accounts receivable allowances written off against related accounts receivables	4,969	$ 3,539	$ 6,659
Accounts receivable allowances were netted against deferred revenue	$ 7,089

X

- Definition

Amount of netted accounts receivable charged against deferred revenue.

+ References

No definition available.

+ Details

Name:	dox_AccountsReceivablesAllowances
Namespace Prefix:	dox_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Valuation of write-downs of deferred tax assets charged against the allowance.

+ References

No definition available.

+ Details

Name:	dox_DeferredTaxAssetsValuationAllowanceWrittenOff
Namespace Prefix:	dox_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	srt_ValuationAndQualifyingAccountsAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration