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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]      
Federal statutory income tax expense (benefit) $ 12,628 $ 7,169 $ (1,429)
State income taxes, net of federal benefit 1,801 716 253
Permanent differences 96 (434) 395
Change in state tax rate 896 (804) 0
Change in valuation allowance 343 (632) 1,273
Tax credits (1,796) (1,207) (945)
Other 103 (819) (40)
Total income tax expense (benefit) $ 14,071 $ 3,989 $ (493)