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Treasury Stock (Details) - Schedule of repurchase of common stock - USD ($)
 1 Months Ended 12 Months Ended 56 Months Ended
Jan. 21, 2016
May 31, 2016
May 31, 2015
May 31, 2014
Sep. 30, 2010
May 31, 2015
Feb. 29, 2016
Dec. 16, 2015
Jul. 22, 2015
Oct. 01, 2009
Class of Stock [Line Items]                    
Authorized stock repurchase amount         $ 44,000,000.0 [1]     $ 200,000,000   $ 200,000,000
Stock Repurchase Program, Increase in Authorized Amount                 $ 50,000,000  
Amount of stock repurchased in period   $ 14,400,000 $ 3,500,000 $ 6,200,000   $ 48,500,000        
Remaining authorized repurchase amount   $ 45,500,000                
Shares of stock repurchased (in shares)   400,000     5,199,699          
Average cost of stock repurchased (in Dollars per share)   $ 34.75     $ 30.00          
Total cost of treasury stock acquired         $ 156,000,000          
Common Stock [Member]                    
Class of Stock [Line Items]                    
Common Stock, par value per share (in Dollars per share)   $ 0.01 $ 0.01     $ 0.01 $ 0.01      
Maximum [Member]                    
Class of Stock [Line Items]                    
Authorized repurchase price per share (in Dollars per share) $ 40,000,000.00                  
Minimum [Member]                    
Class of Stock [Line Items]                    
Authorized repurchase price per share (in Dollars per share) $ 37,000,000.00                  
[1] Represents the remainder of a $200.0 authorization after giving effect to the purchase of 5,199,699 shares at $30.00 per sharepursuant to a large share repurchase in the form of a modified Dutch auction tender offer that was completed by the Companyon November 3, 2010 for a total cost of $156.0, excluding related fees and expenses.