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Subsequent Event (Details) (USD $) | 12 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Oct. 17, 2014 Subsequent Event [Member] Line of Credit [Member] | Oct. 17, 2014 Subsequent Event [Member] Revolving Credit Facility [Member] | Oct. 17, 2014 Subsequent Event [Member] Letter of Credit [Member] | Oct. 17, 2014 Subsequent Event [Member] URS Corporation | Oct. 17, 2014 Subsequent Event [Member] URS Corporation | Oct. 17, 2014 Subsequent Event [Member] Senior Notes [Member] URS Corporation | Oct. 17, 2014 Subsequent Event [Member] Senior Notes [Member] URS Corporation | Oct. 17, 2014 Subsequent Event [Member] Term Loan A Member Secured Debt [Member] | Oct. 17, 2014 Subsequent Event [Member] Term Loan B Member Secured Debt [Member] | Sep. 30, 2014 Subsequent Event [Member] Senior Notes 5.43% series A due July 2020 and senior discount notes 1.00% series B due July 2022 | Oct. 17, 2014 Subsequent Event [Member] Senior Notes 5.43% series A due July 2020 and senior discount notes 1.00% series B due July 2022 | Oct. 17, 2014 Subsequent Event [Member] Senior Notes 5.43% Series A Due July 2020 | Oct. 17, 2014 Subsequent Event [Member] Senior Discount Notes 1.00% Series B due July 2022
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership acquired |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Consideration paid in cash | $ 70,200,000 | $ 62,100,000 | $ 14,500,000 |  |  |  | $ 2,300,000,000 |  |  |  |  |  |  |  |  |
Consideration paid by issuing stock |  | 14,300,000 | 900,000 |  |  |  | 1,600,000,000 |  |  |  |  |  |  |  |  |
Senior notes assumed in acquisition as part of consideration | 18,300,000 | 5,600,000 |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |
Repayment of acquiree term loan as part of consideration |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |
Repayment of acquiree line of credit as part of consideration |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |
Percentage price of original principal amount of note at which note can be redeemed |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |
Amount of notes purchased |  |  |  |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |
Borrowing capacity |  |  |  |  | 1,050,000,000 | 500,000,000 |  |  |  |  | 1,925,000,000 | 760,000,000 |  |  |  |
Maximum increase in borrowing capacity |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Repayment of indebtedness | 1,998,882,000 | 2,156,399,000 | 1,550,996,000 |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |
Prepayment of accrued interest and prepayment penalty |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 56,000,000 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.43% | 1.00%

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