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Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Income
Net (loss) income	$ (448,000)	$ 105,400	$ 93,500	$ 65,100	$ 105,400	$ 75,100	$ (107,700)	$ 124,400	$ (183,990)	$ 197,127	$ 421,476
Other comprehensive (loss) income, net of tax:
Net unrealized (loss) gain on derivatives, net of tax									(13,972)	1,693	4,605
Foreign currency translation adjustments									(46,628)	(82,717)	65,389
Pension adjustments, net of tax									(100,367)	79,523	87,061
Other comprehensive (loss) income, net of tax									(160,967)	(1,501)	157,055
Comprehensive (loss) income, net of tax									(344,957)	195,626	578,531
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax									(76,960)	(61,827)	(82,220)
Comprehensive (loss) income attributable to AECOM, net of tax									$ (421,917)	$ 133,799	$ 496,311

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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