Disposal Group Not Discontinued Operation Gain Loss On Disposals

No definition available.

Name:	dox_DisposalGroupNotDiscontinuedOperationGainLossOnDisposals
Namespace Prefix:	dox_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Proceeds From Sale Of Open Market

+ References

No definition available.

+ Details

Name:	dox_ProceedsFromSaleOfOpenMarket
Namespace Prefix:	dox_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479907/805-20-50-5

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount classified as goodwill attributable to disposal group held for sale or disposed of.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 10
-SubTopic 20
-Topic 205
-Publisher FASB
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-Paragraph 5B
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483475/205-20-45-11

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

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Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dox_TeocoAndProcomMember
Namespace Prefix:
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- Details

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Acquisitions and Divestiture of a Subsidiary - Additional Information (Detail)		12 Months Ended
	Nov. 10, 2020 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) Business	Sep. 30, 2021 USD ($) Business
Acquisitions and Divestiture of a Subsidiary [Line Items]
Number of businesses acquired \| Business			2	3
Business divestiture pre-tax gain	$ 300,000		$ 10,000
Disposal Group Not Discontinued Operation Gain Loss On Disposals				$ 226,410
Disposal Group, Including Discontinued Operation, Net assets				9,194
Disposal Group, Including Discontinued Operation, Goodwill				61,396
DevOps and Roam [Member]
Acquisitions and Divestiture of a Subsidiary [Line Items]
Business acquisition			$ 54,091,000
Teoco and ProCom [Member]
Acquisitions and Divestiture of a Subsidiary [Line Items]
Business acquisition		$ 130,318,000
Description of business entity acquisitions		the Company completed three immaterial business acquisitions
Sourced [Member]
Acquisitions and Divestiture of a Subsidiary [Line Items]
Business acquisition				$ 101,864,000