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Income Taxes - Current and Deferred Income Tax Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Deferred Income Tax Assets And Liabilities    
Income before income taxes $ 20,327 $ 52,688
Current income tax expense 6,522 11,227
Deferred income tax expense (benefit) (684) 3,601
Total income tax expense $ 5,838 $ 14,828