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Commitments and Contingencies (Details) In Millions, unless otherwise specified |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 Standby letters of credit USD ($) | Sep. 30, 2013 Global Linguists Solutions Joint Venture USD ($) | Sep. 30, 2013 AECOM Australia item | Sep. 30, 2006 AECOM Australia AUD | Sep. 30, 2013 Hawaii Project item
Commitments and Contingencies |  |  |  |  |
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees | $ 271.9 |  |  |  |
Amount withheld by the U.S. government for payments due under a contract because of a dispute |  | 19 |  |  |
Proceeds from initial public offering (IPO) |  |  |  | 700 |
Bank loan |  |  |  | 1,400.0 |
Number of initial public offering investors |  |  | 770 |  |
Number of actions filed till date |  |  |  |  | 0

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