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Schedule - Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |  |  |
Valuation allowances on deferred tax assets written off against the deferred tax assets | $ 7,588 |  | $ 2,416
Accounts receivable allowances written off against related accounts receivables | $ 3,539 | $ 6,659 | 3,008
Accounts receivable allowances were netted against deferred revenue |  |  | $ 5,291

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

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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration