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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 7,619 $ 6,467
Share-Based Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of share-based awards vested 20,900 15,700
Share-based compensation expense 7,000 $ 6,100
Compensation not yet recognized $ 56,600  
Total unrecognized compensation cost, weighted average period 2 years 3 months 18 days