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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]      
Income tax computed at statutory rate $ 30,182 $ 14,971 $ (24,494)
State income taxes, net of federal benefit 1,564 1,300 (590)
Deferred rate change (904) 260 (88)
Changes in uncertain tax positions 0 (2) (7)
Permanent differences 2,433 2,177 2,908
Tax credits (12,088) (939) (14,902)
Other, net 359 206 (44)
Total expense (benefit) $ 21,546 $ 17,973 $ (37,217)