Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

v3.8.0.1
INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Operating Loss Carryforwards [Line Items]          
Reduction to income tax expense $ 1,234 $ 1,234      
Share based compensation tax benefits     $ 1,720 $ 418  
Effective tax rate (as a percent)   23.20% 30.50% 29.40%  
Federal statutory tax rate (as a percent)   35.00% 35.00% 35.00%  
Foreign subsidiaries income before income taxes   $ 24,118 $ 48,864 $ 40,024  
Undistributed earnings of foreign subsidiaries   596,281      
Valuation allowances   (20,866) (22,412)    
Unrecognized tax benefits   7,968 13,820 $ 4,086 $ 4,311
Change in unrecognized tax benefits   3,587      
Total penalties and interest accrued   1,779 $ 2,088    
Capital Loss Carryforward          
Operating Loss Carryforwards [Line Items]          
Amount of tax credit carryforward   20,930      
Foreign Tax Authority          
Operating Loss Carryforwards [Line Items]          
Amount of operating loss carryforwards   84,175      
Amount of tax credit carryforward   3,080      
Domestic Tax Authority          
Operating Loss Carryforwards [Line Items]          
Amount of operating loss carryforwards   $ 2,232