Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Reconciliation of Federal Statutory Tax Rate to Consolidated Effective Tax Rate (Details)

v3.8.0.1
INCOME TAXES - Reconciliation of Federal Statutory Tax Rate to Consolidated Effective Tax Rate (Details)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]      
Federal statutory tax rate (as a percent) 35.00% 35.00% 35.00%
Effect of state income taxes, net of federal deduction (as a percent) 1.40% (0.60%) 1.80%
Foreign taxes less than federal statutory rate (as a percent) (7.20%) (3.50%) (3.20%)
Share-based compensation (as a percent) (1.20%) 0.00% 0.00%
Other (as a percent) (4.80%) (0.40%) (4.20%)
Effective tax rate (as a percent) 23.20% 30.50% 29.40%