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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 8,747 $ 7,005 $ 16,366 $ 13,472
Share-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     22,900 17,600
Share-based compensation expense 8,100 $ 6,400 15,000 $ 12,600
Compensation not yet recognized $ 49,100   $ 49,100  
Total unrecognized compensation cost, weighted average period     2 years 29 days