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Treasury Stock (Details) - Schedule of repurchase of common stock - USD ($)
 12 Months Ended 56 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Sep. 30, 2010
May. 31, 2015
Oct. 01, 2009
Stockholders' Equity Attributable to Parent [Abstract]            
Authorized stock repurchase amount       $ 44,000,000.0 [1]   $ 200,000,000
Amount of stock repurchased in period $ 3,500,000 $ 6,200,000 $ 11,800,000   $ 34,100,000  
Remaining authorized repurchase amount $ 9,900,000       $ 9,900,000  
Shares of stock repurchased (in shares) 100,000     5,199,699    
Average cost of stock repurchased (in Dollars per share) $ 31.64     $ 30.00    
Total cost of treasury stock acquired       $ 156,000,000    
[1] Represents the remainder of a $200.0 authorization after giving effect to the purchase of 5,199,699 shares at $30.00 per share pursuant to a large share repurchase in the form of a modified Dutch auction tender offer that was completed by the Company on November 3, 2010 for a total cost of $156.0, excluding related fees and expenses.