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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]      
Statutory income tax rate 35.00% 35.00% 35.00%
State income tax 1.00% 2.00% 2.00%
Other differences (2.00%) (1.00%) (1.00%)
Effective income tax rate 34.00% 36.00% 36.00%