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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Federal:      
Current $ 50,854 $ 53,820 $ 49,782
Deferred 7,187 (8,468) (7,858)
Federal 58,041 45,352 41,924
State:      
Current 6,600 5,584 5,310
Deferred (934) (1,413) (1,486)
Deferred 5,666 4,171 3,824
Total      
Current 57,454 59,404 55,092
Deferred 6,253 (9,881) (9,344)
Income tax expense $ 63,707 $ 49,523 $ 45,748