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Shareholders' Equity
 6 Months Ended
Nov. 30, 2015
Stockholders' Equity Note [Abstract]  
Shareholders' Equity
SHAREHOLDERS’ EQUITY

On April 10, 2015, we entered into an accelerated share repurchase program (the ''ASR'') with a financial institution to repurchase an aggregate of $100 million of our common stock. In exchange for an up-front payment of $100 million, the financial institution committed to deliver a number of shares during the ASR's purchase period, which ended on June 16, 2015. On April 14, 2015, 1,630,988 shares were initially delivered to us. At May 31, 2015, we accounted for the variable component of remaining shares to be delivered under the ASR as a forward contract indexed to our common stock which met all of the applicable criteria for equity classification. On June 16, 2015, an additional 324,742 shares were delivered to us. The total number of shares delivered under the ASR was 1,955,730 shares at an average price of $51.13 per share.

In addition to the ASR, 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. During the three and six months ended November 30, 2014, we repurchased and retired 1,313,848 and 4,879,012 shares of our common stock at a cost of $47.4 million and $171.9 million, or an average cost of $36.11 and $35.23 per share, including commissions. As of November 30, 2015, we had a remaining authorized amount of $327.5 million for share repurchases.