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Debt - URS Senior Notes and Other Debt (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 24, 2014 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Apr. 03, 2017 | Sep. 30, 2016 | Sep. 29, 2016 | Oct. 17, 2014
Debt |  |  |  |  |  |  |  |  |
Debt |  | $ 3,966.3 |  | $ 3,966.3 |  |  | $ 4,125.3 |  |
Average effective interest rate on total debt, including effects of interest rate swaps |  |  |  | 4.40% | 4.30% |  |  |  |
Amortization of deferred debt issuance costs |  | 2.8 | $ 5.1 | $ 14.3 | $ 13.3 |  |  |  |
Term loan A |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  | $ 185.0 |
URS Senior Notes |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed | 101.00% |  |  |  |  |  |  |  |
Amount of debt redeemed | $ 572.3 |  |  |  |  |  |  |  |
Debt |  | 247.7 |  | 247.7 |  |  | 427.7 |  | $ 1,000.0
URS Senior Notes | 2017 URS Senor Notes |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.85%
Amount of debt redeemed |  |  |  |  |  | $ 179.2 |  |  |
URS Senior Notes | 2017 URS Senor Notes | Level 2 |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Fair value of debt instrument |  | 256.6 |  | 256.6 |  |  |  |  |
URS Senior Notes | 2022 URS Senior Notes |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.00%
Other Debt |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Debt |  | 108.5 |  | 108.5 |  |  | 142.7 |  |
Other Debt | Unsecured | Standby letter of credit |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  | 437.4 |  | 437.4 |  |  | $ 382.2 |  |
Remaining borrowing capacity under the credit facility |  | $ 501.6 |  | $ 501.6 |  |  |  |  |

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