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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards (Details) - Share-Based Awards
shares in Thousands
9 Months Ended
Feb. 29, 2016
$ / shares
shares
Shares  
Unvested at May 31, 2015 | shares 1,848
Granted | shares 450
Vested | shares (623)
Forfeited | shares (51)
Unvested at February 29, 2016 | shares 1,624
Weighted-Average Grant-Date Fair Value  
Unvested at May 31, 2015 (in dollars per share) | $ / shares $ 29
Granted (in dollars per share) | $ / shares 57
Vested (in dollars per share) | $ / shares 27
Forfeited (in dollars per share) | $ / shares 34
Unvested at November 30, 2015 (in dollars per share) | $ / shares $ 37