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Commitments and Contingencies (Details) In Millions, unless otherwise specified	0 Months Ended		12 Months Ended		6 Months Ended	0 Months Ended
	Jun. 17, 2014 AUD	Sep. 30, 2014 Standby Letters of Credit [Member] USD ($)	Sep. 30, 2014 AECOM Australia [Member] item	Sep. 30, 2006 AECOM Australia [Member] AUD	Mar. 31, 2014 RCM applicants AUD	Jun. 17, 2014 Portigon AG AUD
Commitments and Contingencies
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees		$ 313.1
Proceeds from initial public offering (IPO)				700
Bank loan				1,400.0
Number of initial public offering investors			770
Damages claimed by applicants					1,680	76
Securities acquired by investors	155

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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