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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Federal:      
Current $ 54,817 $ 58,667 $ 50,854
Deferred (4,767) 3,334 7,187
Federal 50,050 62,001 58,041
State:      
Current 7,837 4,425 6,600
Deferred (1,872) 1,224 (934)
Deferred 5,965 5,649 5,666
Total      
Current 62,654 63,092 57,454
Deferred (6,639) 4,558 6,253
Income tax expense $ 56,015 $ 67,650 $ 63,707