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Income Tax Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Current:      
Federal $ 11,900 $ 16,077 $ 17,083
State 5,019 6,237 7,086
Deferred      
Federal (2,563) 8,263 (2,643)
State (618) 3,098 (901)
Income tax expense $ 13,738 $ 33,675 $ 20,625