Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Long-term debt
Long-term debt, Carrying Value	$ 835,000	$ 875,000
Long-term debt, Fair Value	846,413	898,875
Level 2 \| Senior notes due 2032
Long-term debt
Long-term debt, Carrying Value	600,000	600,000
Long-term debt, Fair Value	612,000	622,500
Level 2 \| Term Loan B Due 2030
Long-term debt
Long-term debt, Carrying Value	235,000	275,000
Long-term debt, Fair Value	234,413	276,375
Fair Value, Recurring
Financial Assets:
Total assets	799	716
Financial Liabilities:
Total liabilities	736	282
Fair Value, Recurring \| Level 2 \| Other current assets \| Designated cash flow hedges
Financial Assets:
Cash flow hedges	64	87
Fair Value, Recurring \| Level 2 \| Other current assets \| Non-Designated Derivative Instruments
Financial Assets:
Cash flow hedges	735	570
Fair Value, Recurring \| Level 2 \| Other assets
Financial Assets:
Interest rate swap	0	59
Fair Value, Recurring \| Level 2 \| Accrued Liabilities \| Designated cash flow hedges
Financial Liabilities:
Cash flow hedges	351	57
Fair Value, Recurring \| Level 2 \| Accrued Liabilities \| Non-Designated Derivative Instruments
Financial Liabilities:
Cash flow hedges	379	225
Fair Value, Recurring \| Level 2 \| Other Liabilities
Financial Liabilities:
Interest rate swap	$ 6	$ 0

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

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