Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 243,196	$ (56,933)	$ 284,090
Unrealized gain (loss) on derivatives:
Unrealized holding gain (loss) on derivatives	(260)	(5,043)
Reclassification adjustments for losses included in net income	1,828	1,327
Net unrealized gain (loss) on derivatives, net of tax	1,568	(3,716)
Foreign currency translation adjustments	(70,441)	53,895	(45,609)
Pension adjustments, net of tax	(14,582)	(41,778)	5,556
Other comprehensive income (loss), net of tax	(83,455)	8,401	(40,053)
Comprehensive income (loss), net of tax	159,741	(48,532)	244,037
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax	(2,624)	(1,634)	(8,290)
Comprehensive income (loss) attributable to AECOM, net of tax	$ 157,117	$ (50,166)	$ 235,747