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Revenue Recognition (Details) - USD ($) $ in Billions | 9 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Revenue Recognition. |  |
Passed through costs included in revenue and cost of sales | $ 6.6 | $ 5.6

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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