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Income Taxes - Summary of Differences Between U.S. Federal Statutory Rate and Company's Effective Tax Rate (Details)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]    
Statutory tax rate 21.00% 21.00%
State income taxes, net of U.S. federal tax benefit 5.40% 4.80%
Return to accrual adjustment 5.80% 0.00%
Tax credits 0.00% 0.00%
Charges without tax benefit 0.00% 0.10%
Valuation allowance (32.70%) (19.40%)
Other exclusions 1.30% 0.10%
Company’s effective tax rate 0.80% 6.60%