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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]      
Statutory income tax rate 21.00% 21.00% 21.00%
State income tax 2.00% 2.00% 2.00%
Other differences (2.00%) (2.00%) (3.00%)
Effective income tax rate 21.00% 21.00% 20.00%