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Schedule - Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Valuation and Qualifying Accounts [Abstract] |  |  |
Valuation allowances on deferred tax assets written off against the deferred tax assets | $ 2,416 | $ 9,231 | $ 2,235
Accounts receivable allowances written off against related accounts receivables | 3,008 | $ 12,727 |
Accounts receivable allowances were netted against deferred revenue | $ 5,291 |  |

X
- Definition Accounts receivable allowances written off against the related accounts receivable. + References No definition available. + Details
Name: | dox_AccountsReceivableWrittenOff
Namespace Prefix: | dox_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Accounts receivables allowances. + References No definition available. + Details
Name: | dox_AccountsReceivablesAllowances
Namespace Prefix: | dox_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Valuation allowances on deferred tax assets written off against the deferred tax assets. + 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: | us-gaap_ValuationAndQualifyingAccountsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration