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Stockholder's Equity (Details Textuals 1) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended 46 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2015
Jul. 09, 2015
Sep. 22, 2011
Stock Repurchase [Abstract]            
Additional common stock authorized for repurchase (in shares)           40,000,000
Common stock authorized for repurchase (in shares)           98,000,000
Company repurchased common stock (in shares) 231,500   500,000 50,518,282    
Stock repurchase price per share (in dollars per share) $ 36.02   $ 27.77 $ 36.02    
Company repurchased common stock $ 8.3   $ 13.9      
Shares remaining available for repurchase 47,481,718     47,481,718    
Number of shares accepted for purchase under tender offer         13,888,888  
Purchase of common shares from tender offer         6,254,061  
Common shares purchased under tender offer, value         $ 225.1  
Remittance to taxing authorities under statutory withholding in fiscal year 2013, 2012 and 2011 $ 3.8 $ 0.1 $ 0.6      
Maximum            
Stock Repurchase [Abstract]            
Tender price to purchase common shares         $ 36.00  
Minimum            
Stock Repurchase [Abstract]            
Tender price to purchase common shares         $ 34.75