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Stockholder's Equity (Details Textuals 1) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended 70 Months Ended
Jul. 31, 2015
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2017
Dec. 30, 2015
Jul. 09, 2015
Sep. 22, 2011
Stock Repurchase [Abstract]                
Additional common stock authorized for repurchase (in shares)               80,000,000
Common stock authorized for repurchase (in shares)               196,000,000
Company repurchased common stock (in shares)   0 5,877,038 463,000 106,913,602      
Company repurchased common stock $ 8.3   $ 117.9          
Shares remaining available for repurchase   89,086,398     89,086,398      
Remittance to taxing authorities under statutory withholding in fiscal year 2013, 2012 and 2011   $ 134.6 $ 15.0 $ 3.8        
Common Stock [Member]                
Stock Repurchase [Abstract]                
Stock repurchase price per share (in dollars per share) $ 18.01   $ 20.065 $ 18.01        
Common Stock [Member] | Dutch Auction [Member]                
Stock Repurchase [Abstract]                
Common stock authorized for repurchase (in shares)           14,634,146 27,777,776  
Company repurchased common stock (in shares)     16,666,666 12,508,122        
Stock repurchase price per share (in dollars per share)           $ 19.50    
Common Shares Purchased Under Tender Offer, Value     $ 325.0 $ 225.1        
Common Stock [Member] | Dutch Auction [Member] | Maximum                
Stock Repurchase [Abstract]                
Stock Repurchase Program, Share Offer Price           20.50    
Tender price to purchase common shares             $ 18.00  
Common Stock [Member] | Dutch Auction [Member] | Minimum                
Stock Repurchase [Abstract]                
Stock Repurchase Program, Share Offer Price           $ 19.00    
Tender price to purchase common shares             $ 17.375