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SHARE-BASED AWARDS AND OPTIONS - Share-based Compensation Expense and Income Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Share-based compensation expense $ 7,619 $ 6,467
Income tax benefit $ 3,572 $ 2,358