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Commitments and Contingencies (Details)
In Millions, unless otherwise specified
 9 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Jun. 30, 2014
USD ($)
item
Jul. 27, 2014
Subsequent event
item
Jun. 30, 2014
Standby letters of credit
USD ($)
Jun. 30, 2014
AECOM Australia
item
Sep. 30, 2006
AECOM Australia
AUD
Mar. 31, 2014
AECOM Australia
RCM applicants
USD ($)
Jun. 17, 2014
AECOM Australia
Portigon
USD ($)
Commitments and Contingencies              
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees     $ 284.3        
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            
Number of actions filed till date   5          
Number of merger subsidiaries formed for purposes of effecting the merger 2