Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Long-term debt, excluding capital leases
Long-term debt, excluding capital leases, Carrying Value	$ 1,390,211	$ 1,392,961
Long-term debt, excluding capital leases, Fair Value	1,405,758	1,431,086
Level 2 \| Term loan B
Long-term debt, excluding capital leases
Long-term debt, excluding capital leases, Carrying Value	410,250	413,000
Long-term debt, excluding capital leases, Fair Value	405,122	411,451
Level 1 \| Senior notes
Long-term debt, excluding capital leases
Long-term debt, excluding capital leases, Carrying Value	979,961	979,961
Long-term debt, excluding capital leases, Fair Value	1,000,636	1,019,635
Fair Value, Recurring
Financial Assets:
Total assets	462	35
Fair Value, Recurring \| Level 2 \| Other current assets
Financial Assets:
Foreign exchange contracts	329
Fair Value, Recurring \| Level 2 \| Other assets
Financial Assets:
Interest rate caps	133	$ 35
Fair Value, Recurring \| Level 2 \| Accrued Liabilities
Financial Liabilities:
Foreign exchange contracts	$ 612

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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