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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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- Definition

Represents unamortized debt issuance costs.

+ References

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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

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-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ 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 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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