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Discontinued Operations, Goodwill, and Intangible Assets - Significant components included in Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Discontinued Operations, Goodwill, and Intangible Assets |  |
Property and equipment |  | $ 4.6
Intangible assets and capitalized debt issuance costs |  | 12.8
Payments for capital expenditures | $ (3.0) | $ (8.2)

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- Definition Amount of deprecation and amortization expense attributable to intangible assets and capitalized debt issuance costs of discontinued operations. + References No definition available. + Details
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Namespace Prefix: | acm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of deprecation and amortization expense attributable to property, plant and equipment of discontinued operations. + References No definition available. + Details
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Namespace Prefix: | acm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | acm_DiscontinuedOperationsGoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | acm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of capital expenditure attributable to discontinued operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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