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Segment Information and Sales to Significant Customers - Additional Information (Detail)	12 Months Ended
	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%

X

- 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

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