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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 |  |  |  |  |  |

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