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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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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 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 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 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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