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INCOME TAXES (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2019
Sep. 30, 2018
Income Tax [Abstract]              
Effective income tax rate 18.30%   22.40% 47.00% 21.10%    
Federal statutory tax rate       21.00%      
Transition tax on un-repatriated earnings of foreign subsidiaries payment period       8 years      
Provisional discrete tax expense $ (299) $ 32,880          
Transition tax for accumulated foreign earnings, Income tax expense   $ 2,071   $ 24,641 $ 0    
Transition tax for accumulated foreign earnings, Liability, Noncurrent $ 22,450     22,450      
Provisional non-US withholding taxes       6,126      
Discrete non-cash expense, change in tax rate       $ 1,813      
Forecast [Member]              
Income Tax [Abstract]              
Federal statutory tax rate           21.00% 24.50%
Foreign Country [Member] | South Korea [Member]              
Income Tax Holiday [Abstract]              
Percentage of local statutory rate in effect for 2017         50.00%    
Percentage of local statutory rate in effect for 2016         50.00%    
Percentage applicable on federal statutory tax rate - 2015         0.00%    
Percentage applicable on federal statutory tax rate - 2014         0.00%    
Percentage applicable on federal statutory tax rate - 2013         0.00%    
Income tax provision reduction as a result of the tax holiday         $ 3,094    
Tax Holiday approximate diluted earning per share benefit (in dollars per share)         $ 0.12