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SHARE-BASED AWARDS AND OPTIONS - Stock Options Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     145 400
Share-based compensation expense $ 7,000 $ 5,682 $ 20,472 $ 14,827
Aggregate intrinsic value of stock options exercised     5,200 11,700
Total unrecognized compensation cost $ 3,300   $ 3,300  
Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair market value, percentage 100.00%   100.00%  
Stock option term     10 years  
Share-based compensation expense $ 400 $ 200 $ 1,000 $ 500
Total unrecognized compensation cost, weighted average period     2 years 30 days  
Stock Option Plan 2011        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value for each option granted $ 16 $ 9 $ 16 $ 9
Granted Before Fiscal 2015 | Employee stock option | Performance period. year one        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     25.00%  
Granted Before Fiscal 2015 | Employee stock option | Performance period, year two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     25.00%  
Granted Before Fiscal 2015 | Employee stock option | Performance period, year three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     25.00%  
Granted Before Fiscal 2015 | Employee stock option | Performance period, year four        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     25.00%  
Granted Fiscal 2015 | Employee stock option | Performance period. year one        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     33.00%  
Granted Fiscal 2015 | Employee stock option | Performance period, year two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     33.00%  
Granted Fiscal 2015 | Employee stock option | Performance period, year three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting rights     33.00%