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SHARE-BASED AWARDS AND OPTIONS - Share-based Compensation Expense and Income Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation expense $ 7,000 $ 5,682 $ 20,472 $ 14,827
Income tax benefit $ 2,191 $ 1,945 $ 6,828 $ 4,769