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Revenue Recognition (Details) - USD ($) $ in Billions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Revenue Recognition.
Passed through costs included in revenue and cost of sales	$ 7.7	$ 6.8	$ 7.2

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- Definition

The costs of subcontracts for services and other direct costs incurred by the entity on behalf of its clients. These costs are passed through to clients and included in revenue and cost of revenue.

+ References

No definition available.

+ Details

Name:	acm_PassedThroughCostInRevenueAndCost
Namespace Prefix:	acm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration