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Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 12,900	$ 84,400	$ 66,600	$ (400)	$ 26,500	$ (200)	$ 20,600	$ (118,100)	$ 163,472	$ (71,233)	$ 232,764
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on derivatives, net of tax									5,987	(9,196)	315
Foreign currency translation adjustments									(65,224)	(285,520)	(72,715)
Pension adjustments, net of tax									(164,911)	12,953	(24,161)
Other comprehensive loss, net of tax									(224,148)	(281,763)	(96,561)
Comprehensive (loss) income, net of tax									(60,676)	(352,996)	136,203
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax									(65,697)	(80,347)	(1,652)
Comprehensive (loss) income attributable to AECOM, net of tax									(126,373)	(433,343)	134,551
Reportable Legal Entities | Parent
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)									96,200	(154,800)	229,900
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on derivatives, net of tax									2,600	(6,100)	300
Pension adjustments, net of tax									(3,300)	1,800	(9,900)
Other comprehensive loss, net of tax									(700)	(4,300)	(9,600)
Comprehensive (loss) income, net of tax									95,500	(159,100)	220,300
Comprehensive (loss) income attributable to AECOM, net of tax									95,500	(159,100)	220,300
Reportable Legal Entities | Guarantor Subsidiaries
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)									284,900	82,200	179,600
Other comprehensive income (loss), net of tax:
Pension adjustments, net of tax									(14,900)	6,400
Other comprehensive loss, net of tax									(14,900)	6,400
Comprehensive (loss) income, net of tax									270,000	88,600	179,600
Comprehensive (loss) income attributable to AECOM, net of tax									270,000	88,600	179,600
Reportable Legal Entities | Non-Guarantor Subsidiaries
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)									304,100	271,200	217,700
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on derivatives, net of tax									3,400	(3,100)
Foreign currency translation adjustments									(65,300)	(285,600)	(72,700)
Pension adjustments, net of tax									(146,700)	4,800	(14,300)
Other comprehensive loss, net of tax									(208,600)	(283,900)	(87,000)
Comprehensive (loss) income, net of tax									95,500	(12,700)	130,700
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax									(65,700)	(80,300)	(1,600)
Comprehensive (loss) income attributable to AECOM, net of tax									29,800	(93,000)	129,100
Eliminations
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)									(521,700)	(269,800)	(394,400)
Other comprehensive income (loss), net of tax:
Comprehensive (loss) income, net of tax									(521,700)	(269,800)	(394,400)
Comprehensive (loss) income attributable to AECOM, net of tax									$ (521,700)	$ (269,800)	$ (394,400)

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