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Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018 | Oct. 17, 2014
--- | --- | --- | ---
Debt |  |  |
Total debt | $ 3,964,500 | $ 3,673,500 |
Less: Current portion of debt and short-term borrowings | (160,800) | (143,100) |
Less: Unamortized debt issuance costs | (44,200) | (46,700) |
Long-term debt | 3,759,491 | 3,483,746 |
2014 Credit Agreement |  |  |
Debt |  |  |
Total debt | 1,699,800 | 1,433,800 |
2014 Senior Notes |  |  |
Debt |  |  |
Total debt | 800,000 | 800,000 |
2017 Senior Notes |  |  |
Debt |  |  |
Total debt | 1,000,000 | 1,000,000 |
URS Senior Notes |  |  |
Debt |  |  |
Total debt | 247,900 | 247,900 | $ 1,000,000
Other Debt |  |  |
Debt |  |  |
Total debt | $ 216,800 | $ 191,800 |

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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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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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