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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)

X

- 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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Balance Type:	debit
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X

- 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_
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X

- References

No definition available.

+ Details

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Namespace Prefix:	acm_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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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