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SHARE-BASED AWARDS AND OPTIONS - Share Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 30,809 $ 21,056 $ 29,793  
Income tax benefit $ 9,879 $ 6,907 $ 7,126  
Stock Option Plan 2011        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance (in shares)       14,000,000