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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Income Tax Disclosure [Abstract]        
Federal statutory income tax expense 21.00% 21.00% 21.00% 21.00%
State income taxes, net of federal benefit 2.90% 7.00% 2.90% 5.00%
Permanent differences 0.50% (5.90%) 0.40% (7.10%)
Change in valuation allowance 0.00% 0.00% 0.00% (7.40%)
Tax credits (3.10%) 2.20% (2.60%) (2.30%)
Other 2.10% 0.00% 0.80% 0.00%
Total income tax expense 23.40% 24.30% 22.60% 9.10%