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Debt - 2014 Credit Agreement (Details) - 2014 Credit Agreement $ in Millions		6 Months Ended
	Sep. 29, 2016 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Oct. 17, 2014 USD ($)
Term loan A
Debt agreements
Borrowing capacity	$ 185.0			$ 1,925.0
Term loan B
Debt agreements
Borrowing capacity				760.0
Revolving credit facility
Debt agreements
Borrowing capacity				1,050.0
Outstanding letters of credit		$ 51.0	$ 92.3
Remaining borrowing capacity under the credit facility		$ 870.1	$ 888.4
Line of Credit
Debt agreements
Maximum increase in borrowing capacity				$ 500.0
Maximum consolidated leverage ratio	5.00	4.75
Consolidated leverage ratio		4.5
Consolidated interest coverage ratio		4.6
Secured | Line of Credit
Debt agreements
Borrowing capacity	$ 500.0

X

- Definition

Represents the consolidated interest coverage ratio.

+ References

No definition available.

+ Details

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Namespace Prefix:	acm_
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X

- Definition

Represents the consolidated leverage ratio.

+ References

No definition available.

+ Details

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X

- Definition

Ratio related to maximum consolidated leverage.

+ References

No definition available.

+ Details

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Data Type:	xbrli:pureItemType
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X

- Definition

Represents the maximum amount of increase in borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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X

- References

No definition available.

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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