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v3.20.4

Segment Information and Sales to Significant Customers - Additional Information (Detail) | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Revenue, Major Customer [Line Items] |  |  |
Minimum percentage of total revenue accounted for one customer | 10.00% | 10.00% | 10.00%

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- Definition Minimum percentage of sales to significant customer. + References No definition available. + Details
Name: | dox_MinimumPercentageOfSalesToSignificantCustomer
Namespace Prefix: | dox_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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 No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration