XML 123 R112.htm IDEA: XBRL DOCUMENT
v3.25.3

Segment Information and Revenue from Significant Customers - Summary Sales to Significant Customers (Detail) - Revenue [Member] - Customer Concentration Risk [Member] | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Customer 1 [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue from significant customer | 25.90% | 24.50% | 23.80%
Customer 2 [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue from significant customer | 19.90% | 22.60% | 23.10%

X
- Definition Concentration Risk Threshold Percentage + References No definition available. + Details
Name: | dox_ConcentrationRiskThresholdPercentage
Namespace Prefix: | dox_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=dox_CustomerOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=dox_CustomerTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |