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SHARE-BASED AWARDS AND OPTIONS - Stock Options Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
7 Months Ended 12 Months Ended
Dec. 31, 2016
May 31, 2016
May 31, 2015
May 31, 2014
May 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares) 73 145 306   0
Share-based compensation expense $ 18,707 $ 30,809 $ 21,056 $ 29,793  
Aggregate intrinsic value of stock options exercised 6,500 9,400 16,600 24,900  
Total unrecognized compensation cost   $ 1,700      
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair market value, percentage   100.00%      
Stock option term   10 years      
Share-based compensation expense $ 1,100 $ 1,400 $ 700 $ 1,000  
Total unrecognized compensation cost, weighted average period (in years)   1 year 10 months 24 days      
Stock Option Plan 2011          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant date fair value (in dollars per share) $ 21.87 $ 15.60 $ 8.45    
Granted Before Fiscal 2015 | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   4 years      
Granted Fiscal 2015 | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years