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Fair Value Measurements - Carrying Value and Estimated Fair Value of Long-term Debt and Finance Leases, Including Current Maturities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Fair Value Disclosures [Abstract]    
Long-term debt and finance leases, including current maturities, carrying value $ 230,608 $ 315,210
Long-term debt and finance leases, including current maturities, fair value $ 219,900 $ 305,300