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Debt - Redemption (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 24, 2014 | Oct. 17, 2014 | Oct. 06, 2014 | Sep. 30, 2016 | Sep. 30, 2015
Debt |  |  |  |  |
Total debt |  |  |  | $ 4,125,300,000 | $ 4,606,900,000
Average effective interest rate on total borrowings, including the effects of swaps (as a percent) |  |  |  | 4.40% | 4.20%
Other Debt |  |  |  |  |
Debt |  |  |  |  |
Total debt |  |  |  | $ 142,700,000 | $ 163,200,000
Outstanding letters of credit |  |  |  | 382,200,000 | 344,000,000
Unsecured Credit Facilities |  |  |  |  |
Debt |  |  |  |  |
Remaining borrowing capacity under the credit facility |  |  |  | 546,200,000 |
Notes |  |  |  |  |
Debt |  |  |  |  |
Total debt |  |  |  | 1,600,000,000 | 1,600,000,000
The 2022 Notes |  |  |  |  |
Debt |  |  |  |  |
Principal amount |  |  | $ 800,000,000 |  |
Interest rate (as a percent) |  |  | 5.75% |  |
Fair value of debt instrument |  |  |  | 838,000,000 |
The 2022 Notes | Redemption period one |  |  |  |  |
Debt |  |  |  |  |
Redemption period, end date |  |  | Oct. 15, 2017 |  |
Percentage of principal amount that can be redeemed |  |  | 105.75% |  |
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed |  |  | 100.00% |  |
The 2024 Notes |  |  |  |  |
Debt |  |  |  |  |
Principal amount |  |  | $ 800,000,000 |  |
Interest rate (as a percent) |  |  | 5.875% |  |
Fair value of debt instrument |  |  |  | 850,000,000 |
The 2024 Notes | Redemption period two |  |  |  |  |
Debt |  |  |  |  |
Redemption period, end date |  |  | Jul. 15, 2024 |  |
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed |  |  | 100.00% |  |
The 2024 Notes | Redemption period three |  |  |  |  |
Debt |  |  |  |  |
Redemption period, end date |  |  | Jul. 15, 2024 |  |
Percentage of principal amount that can be redeemed |  |  | 100.00% |  |
Senior Notes | URS Corporation |  |  |  |  |
Debt |  |  |  |  |
Redemption price percentage | 101.00% | 101.00% |  |  |
Total debt |  |  |  | 427,700,000 | $ 429,400,000
Amount of notes purchased | $ 572,300,000 |  |  |  |
Senior Notes 3.85% due 2017 |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) |  | 3.85% |  |  |
Senior Notes 3.85% due 2017 | URS Corporation |  |  |  |  |
Debt |  |  |  |  |
Fair value of long term debt | 180,100,000 |  |  |  |
Total debt |  |  |  | 180,100,000 |
Senior Notes 5.00% due 2022 |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) |  | 5.00% |  |  |
Senior Notes 5.00% due 2022 | URS Corporation |  |  |  |  |
Debt |  |  |  |  |
Fair value of long term debt | $ 243,600,000 |  |  |  |
Total debt |  |  |  | $ 247,600,000 |
Maximum | The 2022 Notes | Redemption period one |  |  |  |  |
Debt |  |  |  |  |
Percentage of principal amount that can be redeemed |  |  | 35.00% |  |

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