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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - shares
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0 0
Basic weighted-average number of shares outstanding (in shares) 132,284,000 134,072,000 144,238,000
Plus: Dilutive effect of stock options and other share-based awards (in shares) 883,000 850,000 1,138,000
Diluted weighted-average number of shares outstanding (in shares) 133,167,000 134,922,000 145,376,000