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Discontinued Operations, Goodwill, and Intangible Assets - Statement of cash flows (Details) - Held for sale - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Discontinued Operations, Goodwill and Intangible Assets |  |  |
Payments for capital expenditures | $ (2.5) | $ (6.2) | $ (2.7)
Non-cash gain in discontinued operations | $ 12.7 |  |

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- Definition Amount of capital expenditure attributable to discontinued operations, including adjustments. + References No definition available. + Details
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- Definition Amount of non cash gain (loss) resulting from the disposal of a discontinued operation. + References No definition available. + Details
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Namespace Prefix: | acm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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
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- Details
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