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Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statements of Comprehensive Income (Loss)
Net (loss) income	$ (107,755)	$ 115,840	$ 16,658	$ 181,618
Other comprehensive income (loss), net of tax:
Net unrealized (loss) gain on derivatives, net of tax	(1,625)	2,333	(840)	3,700
Foreign currency translation adjustments	15,496	40,885	9,513	(33,039)
Pension adjustments, net of tax	(16,103)	(1,545)	(13,635)	15,428
Other comprehensive (loss) income, net of tax	(2,232)	41,673	(4,962)	(13,911)
Comprehensive (loss) income, net of tax	(109,987)	157,513	11,696	167,707
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax	(12,562)	(13,837)	(26,454)	(32,128)
Comprehensive (loss) income attributable to AECOM, net of tax	(122,549)	143,676	(14,758)	135,579
Reportable Legal Entities | Parent
Consolidated Statements of Comprehensive Income (Loss)
Net (loss) income	(119,700)	102,400	(8,400)	149,600
Other comprehensive income (loss), net of tax:
Net unrealized (loss) gain on derivatives, net of tax	(100)	1,200	600	4,100
Pension adjustments, net of tax	700	700	1,500	1,300
Other comprehensive (loss) income, net of tax	600	1,900	2,100	5,400
Comprehensive (loss) income, net of tax	(119,100)	104,300	(6,300)	155,000
Comprehensive (loss) income attributable to AECOM, net of tax	(119,100)	104,300	(6,300)	155,000
Reportable Legal Entities | Guarantor Subsidiaries
Consolidated Statements of Comprehensive Income (Loss)
Net (loss) income	(14,700)	166,700	187,500	291,500
Other comprehensive income (loss), net of tax:
Comprehensive (loss) income, net of tax	(14,700)	166,700	187,500	291,500
Comprehensive (loss) income attributable to AECOM, net of tax	(14,700)	166,700	187,500	291,500
Reportable Legal Entities | Non-Guarantor Subsidiaries
Consolidated Statements of Comprehensive Income (Loss)
Net (loss) income	(111,700)	114,700	88,500	155,300
Other comprehensive income (loss), net of tax:
Net unrealized (loss) gain on derivatives, net of tax	(1,600)	1,100	(1,500)	(400)
Foreign currency translation adjustments	15,500	40,900	9,500	(33,000)
Pension adjustments, net of tax	(16,800)	(2,200)	(15,100)	14,100
Other comprehensive (loss) income, net of tax	(2,900)	39,800	(7,100)	(19,300)
Comprehensive (loss) income, net of tax	(114,600)	154,500	81,400	136,000
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax	(12,600)	(13,800)	(26,500)	(32,100)
Comprehensive (loss) income attributable to AECOM, net of tax	(127,200)	140,700	54,900	103,900
Eliminations
Consolidated Statements of Comprehensive Income (Loss)
Net (loss) income	138,400	(268,000)	(250,900)	(414,800)
Other comprehensive income (loss), net of tax:
Comprehensive (loss) income, net of tax	138,400	(268,000)	(250,900)	(414,800)
Comprehensive (loss) income attributable to AECOM, net of tax	$ 138,400	$ (268,000)	$ (250,900)	$ (414,800)

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