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Fair Value Measurements - Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Fair Value Disclosures [Abstract]    
Long-term debt and finance leases, including current maturities, carrying value $ 315,210 $ 538,274
Long-term debt and finance leases, including current maturities, fair value $ 305,300 $ 493,600