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EARNINGS PER SHARE (Details) - shares
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Earnings Per Share [Abstract]    
Antidilutive securities (in shares) 0 100,000
Basic weighted-average number of shares outstanding (in shares) 153,901,000 130,328,000
Plus: Dilutive effect of stock options and other share-based awards (in shares) 974,000 818,000
Diluted weighted-average number of shares outstanding (in shares) 154,875,000 131,146,000