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Fair Value Measurements - Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Fair Value Disclosures [Abstract]    
Long-term debt and finance leases, including current maturities, carrying value $ 651,950 $ 670,335
Long-term debt and finance leases, including current maturities, fair value $ 609,700 $ 676,800