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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Federal:      
Current $ 58,667 $ 50,854 $ 53,820
Deferred 3,334 7,187 (8,468)
Federal 62,001 58,041 45,352
State:      
Current 4,425 6,600 5,584
Deferred 1,224 (934) (1,413)
Deferred 5,649 5,666 4,171
Total      
Current 63,092 57,454 59,404
Deferred 4,558 6,253 (9,881)
Income tax expense $ 67,650 $ 63,707 $ 49,523