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Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements of Comprehensive Income
Net income	$ 93,519	$ 65,086	$ (107,755)	$ 124,413	$ 158,605	$ 16,658
Other comprehensive (loss) income, net of tax:
Net unrealized loss on derivatives, net of tax	(4,058)		(1,625)		(10,356)	(840)
Foreign currency translation adjustments	22,754		15,496		965	9,513
Pension adjustments, net of tax	(3,427)		(16,103)		1,903	(13,635)
Other comprehensive income (loss), net of tax	15,269	$ (22,757)	(2,232)	$ (2,730)	(7,488)	(4,962)
Comprehensive income (loss), net of tax	108,788		(109,987)		151,117	11,696
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax	(15,819)		(12,562)		(29,444)	(26,454)
Comprehensive income (loss) attributable to AECOM, net of tax	92,969		(122,549)		121,673	(14,758)
Eliminations
Consolidated Statements of Comprehensive Income
Net income	(312,800)		138,400		(413,900)	(250,900)
Other comprehensive (loss) income, net of tax:
Comprehensive income (loss), net of tax	(312,800)		138,400		(413,900)	(250,900)
Comprehensive income (loss) attributable to AECOM, net of tax	(312,800)		138,400		(413,900)	(250,900)
Parent | Reportable Legal Entities
Consolidated Statements of Comprehensive Income
Net income	78,000		(119,700)		129,400	(8,400)
Other comprehensive (loss) income, net of tax:
Net unrealized loss on derivatives, net of tax	(1,700)		(100)		(4,100)	600
Pension adjustments, net of tax	700		700		1,400	1,500
Other comprehensive income (loss), net of tax	(1,000)		600		(2,700)	2,100
Comprehensive income (loss), net of tax	77,000		(119,100)		126,700	(6,300)
Comprehensive income (loss) attributable to AECOM, net of tax	77,000		(119,100)		126,700	(6,300)
Guarantor Subsidiaries | Reportable Legal Entities
Consolidated Statements of Comprehensive Income
Net income	246,000		(14,700)		306,800	187,500
Other comprehensive (loss) income, net of tax:
Pension adjustments, net of tax	(1,200)				(1,200)
Other comprehensive income (loss), net of tax	(1,200)				(1,200)
Comprehensive income (loss), net of tax	244,800		(14,700)		305,600	187,500
Comprehensive income (loss) attributable to AECOM, net of tax	244,800		(14,700)		305,600	187,500
Non-Guarantor Subsidiaries | Reportable Legal Entities
Consolidated Statements of Comprehensive Income
Net income	82,300		(111,700)		136,300	88,500
Other comprehensive (loss) income, net of tax:
Net unrealized loss on derivatives, net of tax	(2,400)		(1,600)		(6,300)	(1,500)
Foreign currency translation adjustments	22,800		15,500		1,000	9,500
Pension adjustments, net of tax	(2,900)		(16,800)		1,700	(15,100)
Other comprehensive income (loss), net of tax	17,500		(2,900)		(3,600)	(7,100)
Comprehensive income (loss), net of tax	99,800		(114,600)		132,700	81,400
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax	(15,800)		(12,600)		(29,400)	(26,500)
Comprehensive income (loss) attributable to AECOM, net of tax	$ 84,000		$ (127,200)		$ 103,300	$ 54,900

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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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