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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, 2020
Sep. 30, 2019
Fair Value Disclosures [Abstract]    
Long-term debt, including current maturities, carrying value $ 743,250 $ 858,145
Long-term debt, including current maturities, fair value $ 768,700 $ 882,700