Debt and Financing Arrangements - Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Total debt	$ 702,499	$ 776,467
Finance lease obligations	$ 20,249	$ 22,103
Finance lease, liability, statement of financial position [extensible enumeration]	Long-term debt	Long-term debt
Less current maturities	$ (6,379)	$ (6,853)
Long-term debt	696,120	769,614
2027 Senior Secured Notes
Debt Instrument [Line Items]
Total debt	295,629	294,751
Other borrowings
Debt Instrument [Line Items]
Total debt	5,836	15,602
Revolving credit facilities \| Line of Credit
Debt Instrument [Line Items]
Total debt	$ 380,785	$ 444,011

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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