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Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017 | Oct. 17, 2014
--- | --- | --- | ---
Debt |  |  |
Total debt | $ 3,929,800 | $ 3,896,400 |
Less: Current portion of debt and short-term borrowings | (173,000) | (142,000) |
Less: Unamortized debt issuance costs | (49,500) | (52,300) |
Long-term debt | 3,707,293 | 3,702,109 |
2014 Credit Agreement |  |  |
Debt |  |  |
Total debt | 1,667,700 | 908,700 |
2014 Senior Notes |  |  |
Debt |  |  |
Total debt | 800,000 | 1,600,000 |
2017 Senior Notes |  |  |
Debt |  |  |
Total debt | 1,000,000 | 1,000,000 |
URS Senior Notes |  |  |
Debt |  |  |
Total debt | 247,800 | 247,700 | $ 1,000,000
Other Debt |  |  |
Debt |  |  |
Total debt | $ 214,300 | $ 140,000 |

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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