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Debt (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 24, 2014 USD ($) | Oct. 17, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Debt |  |  |  |  |
Total debt |  |  | $ 4,606,900,000 | $ 1,004,000,000 |
Less: Current portion of debt and short-term borrowings |  |  | (160,400,000) | (64,400,000) |
Long-term debt, less current portion |  |  | 4,446,527,000 | 939,565,000 |
Scheduled maturities of debt: |  |  |  |  |
2017 |  |  | 348,300,000 |  |
2018 |  |  | 126,700,000 |  |
2019 |  |  | 97,500,000 |  |
2020 |  |  | 1,507,100,000 |  |
Thereafter |  |  | 2,366,900,000 |  |
Total debt |  |  | 4,606,900,000 | 1,004,000,000 |
2016 |  |  | 160,400,000 |  |
Debt agreements |  |  |  |  |
Repayment of indebtedness |  |  | 5,158,254,000 | 1,976,352,000 | $ 2,155,264,000
Prepayment Penalty On Unsecured Senior Notes |  |  | 55,639,000 |  |
Debt |  |  | $ 4,606,900,000 | $ 1,004,000,000 |
Average effective interest rate on total borrowings, including the effects of swaps (as a percent) |  |  | 4.20% | 2.80% | 3.00%
Line of Credit |  |  |  |  |
Debt agreements |  |  |  |  |
Outstanding letters of credit |  |  | $ 92,500,000 | $ 12,100,000 |
Remaining borrowing capacity under the credit facility |  |  | $ 947,600,000 | 1,037,900,000 |
Actual consolidated leverage ratio |  |  | 4.6 |  |
Maximum increase in borrowing capacity |  | $ 500,000,000 |  |  |
Secured Debt |  |  |  |  |
Debt |  |  |  |  |
Total debt |  |  | $ 2,414,300,000 |  |
Scheduled maturities of debt: |  |  |  |  |
Total debt |  |  | 2,414,300,000 |  |
Debt agreements |  |  |  |  |
Debt |  |  | 2,414,300,000 |  |
Revolving Credit Facility |  |  |  |  |
Debt agreements |  |  |  |  |
Borrowing capacity |  | 1,050,000,000 |  |  |
Letter of Credit |  |  |  |  |
Debt agreements |  |  |  |  |
Borrowing capacity |  | 500,000,000 |  |  |
URS Corporation |  |  |  |  |
Debt agreements |  |  |  |  |
Senior notes assumed in acquisition as part of consideration |  | $ 1,000,000,000 |  |  |
Total debt | $ 5.00 |  |  |  |
Other Debt |  |  |  |  |
Debt |  |  |  |  |
Total debt |  |  | 163,200,000 | 27,600,000 |
Scheduled maturities of debt: |  |  |  |  |
Total debt |  |  | 163,200,000 | 27,600,000 |
Debt agreements |  |  |  |  |
Debt |  |  | 163,200,000 | 27,600,000 |
Outstanding letters of credit |  |  | 344,000,000 | 301,000,000 |
Unsecured Credit Facilities |  |  |  |  |
Debt agreements |  |  |  |  |
Remaining borrowing capacity under the credit facility |  |  | 405,900,000 |  |
Notes |  |  |  |  |
Debt |  |  |  |  |
Total debt |  |  | 1,600,000,000 |  |
Scheduled maturities of debt: |  |  |  |  |
Total debt |  |  | 1,600,000,000 |  |
Debt agreements |  |  |  |  |
Debt |  |  | 1,600,000,000 |  |
Senior Discount Notes 1.00% Series B due July 2022 |  |  |  |  |
Debt agreements |  |  |  |  |
Interest rate (as a percent) |  | 1.00% |  |  |
Notes Payable to Banks |  |  |  |  |
Debt |  |  |  |  |
Total debt |  |  |  | 712,500,000 |
Scheduled maturities of debt: |  |  |  |  |
Total debt |  |  |  | 712,500,000 |
Debt agreements |  |  |  |  |
Debt |  |  |  | 712,500,000 |
Senior Notes |  |  |  |  |
Debt |  |  |  |  |
Total debt |  |  |  | 263,900,000 |
Scheduled maturities of debt: |  |  |  |  |
Total debt |  |  |  | 263,900,000 |
Debt agreements |  |  |  |  |
Debt |  |  |  | $ 263,900,000 |
Senior Notes | URS Corporation |  |  |  |  |
Debt |  |  |  |  |
Total debt |  | $ 1,000,000,000 | 429,400,000 |  |
Scheduled maturities of debt: |  |  |  |  |
Total debt |  | 1,000,000,000 | 429,400,000 |  |
Debt agreements |  |  |  |  |
Debt |  | $ 1,000,000,000 | 429,400,000 |  |
Redemption price percentage | 101.00% | 101.00% |  |  |
Amount of notes purchased | $ 572,300,000 |  |  |  |
Fair value of long term debt |  |  | 408,600,000 |  |
Senior Notes 3.85% due 2017 | URS Corporation |  |  |  |  |
Debt |  |  |  |  |
Total debt |  |  | 182,000,000 |  |
Scheduled maturities of debt: |  |  |  |  |
Total debt |  |  | 182,000,000 |  |
Debt agreements |  |  |  |  |
Interest rate (as a percent) |  | 3.85% |  |  |
Debt |  |  | 182,000,000 |  |
Fair value of long term debt |  |  | 178,700,000 |  |
Senior Notes 5.00% due 2022 | URS Corporation |  |  |  |  |
Debt |  |  |  |  |
Total debt |  |  | 247,400,000 |  |
Scheduled maturities of debt: |  |  |  |  |
Total debt |  |  | 247,400,000 |  |
Debt agreements |  |  |  |  |
Interest rate (as a percent) |  | 5.00% |  |  |
Debt |  |  | 247,400,000 |  |
Fair value of long term debt |  |  | $ 229,900,000 |  |
Senior Notes 5.43% Series A Due July 2020 |  |  |  |  |
Debt agreements |  |  |  |  |
Interest rate (as a percent) |  | 5.43% |  |  |
Term Loan B | Secured Debt |  |  |  |  |
Debt agreements |  |  |  |  |
Borrowing capacity |  | $ 760,000,000 |  |  |
Term Loan A | Secured Debt |  |  |  |  |
Debt agreements |  |  |  |  |
Borrowing capacity |  | 1,925,000,000 |  |  |
Senior Notes 5.43% series A due July 2020 and senior discount notes 1.00% series B due July 2022 |  |  |  |  |
Scheduled maturities of debt: |  |  |  |  |
Debt instrument prepayment of accrued interest and prepayment penalty |  | $ 55,600,000 |  |  |

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