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Schedule - Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |  |  |
Valuation allowances on deferred tax assets written off against the deferred tax assets | $ 1,557 | $ 2,283 | $ 7,588
Accounts receivable allowances written off against related accounts receivables | $ 8,486 | 4,969 | $ 3,539
Accounts receivable allowances written off mainly 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=124255953&loc=SL82919249-210447 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration