XML 93 R71.htm IDEA: XBRL DOCUMENT v3.8.0.1
Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]      
Statutory income tax rate 35.00% 35.00% 35.00%
State income tax 1.00% 1.00% 2.00%
Other differences (4.00%) (2.00%) (1.00%)
Effective income tax rate 32.00% 34.00% 36.00%