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Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income (loss)	$ 232,764	$ 243,196	$ (56,933)
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on derivatives, net of tax	315	1,568	(3,716)
Foreign currency translation adjustments	(72,715)	(70,441)	53,895
Pension adjustments, net of tax	(24,161)	(14,582)	(41,778)
Other comprehensive income (loss), net of tax	(96,561)	(83,455)	8,401
Comprehensive income (loss), net of tax	136,203	159,741	(48,532)
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax	(1,652)	(2,624)	(1,634)
Comprehensive income (loss) attributable to AECOM, net of tax	$ 134,551	$ 157,117	$ (50,166)

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

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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