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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]      
Federal statutory income tax expense $ 7,549 $ 12,628 $ 7,169
State income taxes, net of federal benefit 1,620 1,801 716
Permanent differences 605 96 (434)
Change in tax rates (255) 896 (804)
Change in valuation allowance (176) 343 (632)
Tax credits (2,131) (1,796) (1,207)
Other (366) 103 (819)
Total income tax expense $ 6,846 $ 14,071 $ 3,989