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EARNINGS PER SHARE (Details) - shares
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Earnings Per Share [Abstract]        
Antidilutive securities (in shares)   0 100,000 600,000
Basic weighted-average shares outstanding (in shares) 129,287,000 133,780,000 129,709,000 134,952,000
Plus: Dilutive effect of stock options and other share-based awards (in shares) 873,000 832,000 846,000 830,000
Diluted weighted-average shares outstanding (in shares) 130,160,000 134,612,000 130,555,000 135,782,000