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Income Taxes - Current and Deferred Income Tax Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Deferred Income Tax Assets And Liabilities    
Income before income taxes $ 19,002 $ 20,327
Current income tax expense 6,687 6,522
Deferred income tax benefit (1,224) (684)
Total income tax expense $ 5,463 $ 5,838