Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Long-term debt
Long-term debt, Carrying Value	$ 1,732,552	$ 1,795,383
Long-term debt, Fair Value	1,712,115	1,736,441
Level 2 \| Other Long-Term Debt
Long-term debt
Long-term debt, Carrying Value	842,606	845,383
Long-term debt, Fair Value	823,421	824,951
Level 1 \| Senior notes
Long-term debt
Long-term debt, Carrying Value	889,946	950,000
Long-term debt, Fair Value	888,694	911,490
Fair value measurement on recurring basis
Assets
Total assets	2,216	8,367
Fair value measurement on recurring basis \| Level 2
Assets
Foreign exchange contracts	580
Interest rate caps	1,636	$ 8,367
Liabilities
Foreign exchange contracts	$ 333

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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