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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]      
Statutory income tax rate 21.00% 24.53% 35.00%
State income tax 2.00% 2.00% 1.00%
Impact of change in Federal income tax rate 0.00% (2.00%) 0.00%
Other differences (3.00%) (4.00%) (4.00%)
Effective income tax rate 20.00% 21.00% 32.00%