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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ 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]        
Share-based compensation expense $ 7,000 $ 5,682 $ 20,472 $ 14,827
Share-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     17,000 14,900
Share-based compensation expense 6,500 $ 5,400 19,000 $ 13,800
Compensation not yet recognized $ 43,400   $ 43,400  
Total unrecognized compensation cost, weighted average period     2 years 1 month 6 days