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SHAREHOLDERS EQUITY
 6 Months Ended
Nov. 30, 2016
Stockholders' Equity Note [Abstract]  
SHAREHOLDERS’ EQUITY
SHAREHOLDERS’ EQUITY

From time-to-time, we make repurchases of our common stock mainly through the use of open market purchases and accelerated share repurchase programs ("ASR's"). As of November 30, 2016, we were authorized to repurchase up to $94.5 million of our common stock.

During the six months ended November 30, 2016, 127,435 shares were delivered to us in connection with the completion of an ASR initiated on April 25, 2016. In addition, through open market repurchase plans, we repurchased and retired 1,470,643 and 2,431,359 shares of our common stock at a cost of $104.8 million and $172.4 million, or an average cost of $71.24 and $70.91 per share, including commissions, during the three and six months ended November 30, 2016, respectively.

During the six months ended November 30, 2015, 324,742 shares were delivered to us in connection with the completion of an ASR initiated on April 10, 2015. In addition, through open market repurchase plans, we repurchased and retired 625,573 and 1,320,563 shares of our common stock at a cost of $37.5 million and $75.4 million, or an average cost of $59.87 and $57.07 per share, including commissions, during the three and six months ended November 30, 2015, respectively.