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

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