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

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- Definition Commitments And Contingencies Disclosure [Line Items] + References No definition available. + Details
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Namespace Prefix: | dox_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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
Name: | us-gaap_PaymentsForLegalSettlements
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: |
Data Type: | na
Balance Type: |
Period Type: |