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Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Sep. 30, 2016 | Oct. 17, 2014
--- | --- | --- | ---
Debt |  |  |
Total debt | $ 3,966,300 | $ 4,125,300 |
Less: Current portion of debt and short-term borrowings | (157,100) | (366,300) |
Less: Unamortized debt issuance costs | (55,400) | (56,800) |
Long-Term debt | 3,753,799 | 3,702,157 |
2014 Credit Agreement |  |  |
Debt |  |  |
Total debt | 1,010,100 | 1,954,900 |
2014 Senior Notes |  |  |
Debt |  |  |
Total debt | 1,600,000 | 1,600,000 |
2017 Senior Notes |  |  |
Debt |  |  |
Total debt | 1,000,000 |  |
URS Senior Notes |  |  |
Debt |  |  |
Total debt | 247,700 | 427,700 | $ 1,000,000
Other Debt |  |  |
Debt |  |  |
Total debt | $ 108,500 | $ 142,700 |

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