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Commitments and Contingencies (Details) AUD in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2016 USD ($) | Jul. 10, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2016 USD ($) item | Sep. 30, 2006 AUD
Standby Letters of Credit |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees |  |  |  | $ 474.5 |
Surety Bond |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Surety bonds issued |  |  |  | 3,300.0 |
DOE Deactivation Demolition And Removal Project | URS Corporation | Washington Group International |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Projects costs, minimum |  |  |  | 146.0 |
DOE Deactivation Demolition And Removal Project | Department of Energy |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Projects costs, minimum |  |  |  | 106.0 |
DOE Deactivation Demolition And Removal Project | Department of Energy | URS Corporation | Washington Group International |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Projects costs, minimum |  |  |  | 106.0 |
Projects costs, maximum |  |  |  | $ 146.0 |
Amount recovery (including additional Fees) |  |  | $ 103.0 |  |
Minimum cost to complete the project and promised amenities |  |  | $ 100.0 |  |
AECOM Australia |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Damages claimed by applicants | $ 91.0 |  |  |  |
Proceeds from initial public offering (IPO) | AUD |  |  |  |  | AUD 700
Bank loan | AUD |  |  |  |  | AUD 1,400
Number of initial public offering investors | item |  |  |  | 770 |
Payments for legal settlements |  | $ 205.0 |  |  |

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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 20 -Article 5 Reference 3: 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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