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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, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]    
Statutory tax rate 21.00% 21.00%
State income taxes, net of U.S. federal tax benefit 4.80% 6.60%
Return to accrual adjustment 0.00% (0.60%)
Tax credits 0.00% 0.00%
Charges without tax benefit 0.10% (5.30%)
Valuation allowance (19.40%) (22.10%)
Other exclusions 0.10% 0.70%
Company’s effective tax rate 6.60% 0.30%