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SHAREHOLDERS EQUITY
 3 Months Ended
Aug. 31, 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 August 31, 2016, we were authorized to repurchase up to $199.3 million of our common stock.

During the three months ended August 31, 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 960,716 shares of our common stock at a cost of $67.6 million, or an average cost of $70.39 per share, including commissions.

During the three months ended August 31, 2015, 324,742 shares were delivered to us in connection with the completion of an ASR initiated on April 10, 2015. In addition to the ASR, through open market repurchase plans, we repurchased and retired 694,990 shares of our common stock at a cost of $37.9 million, or an average cost of $54.56 per share, including commissions.