Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Long-term debt, excluding finance lease obligations
Long-term debt, excluding finance lease obligations, Carrying Value	$ 953,000	$ 994,000
Long-term debt, excluding finance lease obligations, Fair Value	953,618	1,008,508
Level 2 \| 2032 Senior Notes
Long-term debt, excluding finance lease obligations
Long-term debt, excluding finance lease obligations, Carrying Value	600,000	600,000
Long-term debt, excluding finance lease obligations, Fair Value	601,500	615,000
Level 2 \| Term Loan B
Long-term debt, excluding finance lease obligations
Long-term debt, excluding finance lease obligations, Carrying Value	353,000	394,000
Long-term debt, excluding finance lease obligations, Fair Value	352,118	393,508
Fair Value, Recurring
Financial Assets:
Total assets	4,253	1,207
Financial Liabilities:
Total liabilities	421	2,120
Fair Value, Recurring \| Level 2 \| Other current assets \| Designated cash flow hedges
Financial Assets:
Cash flow hedges	1,498
Fair Value, Recurring \| Level 2 \| Other current assets \| Non-Designated Derivative Instruments
Financial Assets:
Cash flow hedges	1,842	1,207
Fair Value, Recurring \| Level 2 \| Other assets
Financial Assets:
Interest rate swap	913	0
Fair Value, Recurring \| Level 2 \| Accrued Liabilities \| Designated cash flow hedges
Financial Liabilities:
Cash flow hedges	2
Fair Value, Recurring \| Level 2 \| Accrued Liabilities \| Non-Designated Derivative Instruments
Financial Liabilities:
Cash flow hedges	419	1,485
Fair Value, Recurring \| Level 2 \| Other Liabilities
Financial Liabilities:
Interest rate swap	$ 0	$ 635

Fair value portion of asset recognized for present right to economic benefit.

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