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SHARE-BASED AWARDS AND OPTIONS - Share-based Compensation Expense and Income Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation expense $ 8,747 $ 7,005 $ 16,366 $ 13,472
Income tax benefit $ 2,206 $ 2,279 $ 5,778 $ 4,637