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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards (Details) - Share-Based Awards
shares in Thousands
3 Months Ended
Aug. 31, 2016
$ / shares
shares
Shares  
Unvested at May 31, 2016 (in shares) | shares 1,606
Granted (in shares) | shares 418
Vested (in shares) | shares (687)
Forfeited (in shares) | shares (18)
Unvested at August 31, 2016 (in shares) | shares 1,319
Weighted-Average Grant-Date Fair Value  
Unvested at May 31, 2016 (in USD per share) | $ / shares $ 37.25
Granted (in USD per share) | $ / shares 74.18
Vested (in USD per share) | $ / shares 30.46
Forfeited (in USD per share) | $ / shares 40.85
Unvested at August 31, 2016 (in USD per share) | $ / shares $ 48.95