Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023
Long-term debt, excluding finance lease obligations
Long-term debt, excluding finance lease obligations, Carrying Value	$ 995,000	$ 1,077,961
Long-term debt, excluding finance lease obligations, Fair Value	986,513	1,060,962
Level 1 \| Senior notes
Long-term debt, excluding finance lease obligations
Long-term debt, excluding finance lease obligations, Carrying Value	600,000	679,961
Long-term debt, excluding finance lease obligations, Fair Value	592,500	662,962
Level 2 \| Term Loan B
Long-term debt, excluding finance lease obligations
Long-term debt, excluding finance lease obligations, Carrying Value	395,000	398,000
Long-term debt, excluding finance lease obligations, Fair Value	394,013	398,000
Fair Value, Recurring
Financial Assets:
Total assets	4,010	5,828
Financial Liabilities:
Total liabilities	343	397
Fair Value, Recurring \| Level 2 \| Other current assets \| Non-Designated Derivative Instruments
Financial Assets:
Cash flow hedges	1,028	1,160
Fair Value, Recurring \| Level 2 \| Other assets
Financial Assets:
Interest rate swap	2,982	4,668
Fair Value, Recurring \| Level 2 \| Accrued Liabilities \| Designated cash flow hedges
Financial Liabilities:
Cash flow hedges	146
Fair Value, Recurring \| Level 2 \| Accrued Liabilities \| Non-Designated Derivative Instruments
Financial Liabilities:
Cash flow hedges	$ 197	$ 397

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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