Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Operating Loss Carryforwards [Line Items]        
Share based compensation tax benefits $ 1,720 $ 418 $ 0  
Effective tax rate (as a percent) 30.50% 29.40% 34.50%  
Federal statutory tax rate (as a percent) 35.00% 35.00% 35.00%  
Foreign subsidiaries income before income taxes $ 48,864 $ 40,024 $ 23,835  
Undistributed earnings of foreign subsidiaries 542,821      
Valuation allowances (22,412) (20,977)    
Foreign tax credit carryforwards 5,656      
Unrecognized tax benefits 13,820 4,086 $ 4,311 $ 4,516
Unrecognized tax benefits that would impact effective tax rate 6,663      
Change in unrecognized tax benefits 2,741      
Total penalties and interest accrued 2,088 $ 2,010    
Foreign Tax Authority        
Operating Loss Carryforwards [Line Items]        
Amount of operating loss carryforwards 72,765      
Amount of tax credit carryforward 3,933      
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Amount of operating loss carryforwards 3,999      
Amount of tax credit carryforward 491      
Capital Loss Carryforward        
Operating Loss Carryforwards [Line Items]        
Amount of tax credit carryforward $ 20,651