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Commitments and Contingencies (Details) AUD in Millions, $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 17, 2014 AUD | Mar. 31, 2014 AUD | Sep. 30, 2014 USD ($) item | Sep. 30, 2006 AUD
Commitments and Contingencies |  |  |  |
Securities acquired by investors | AUD 155 |  |  |
Standby Letters of Credit |  |  |  |
Commitments and Contingencies |  |  |  |
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees | $ |  |  | $ 313.1 |
AECOM Australia |  |  |  |
Commitments and Contingencies |  |  |  |
Proceeds from initial public offering (IPO) |  |  |  | AUD 700
Bank loan |  |  |  | AUD 1,400
Number of initial public offering investors | item |  |  | 770 |
RCM applicants |  |  |  |
Commitments and Contingencies |  |  |  |
Damages claimed by applicants |  | AUD 1,680 |  |
Portigon AG |  |  |  |
Commitments and Contingencies |  |  |  |
Damages claimed by applicants | AUD 76 |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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