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Stockholder's Equity (Details Textuals 1) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Sep. 22, 2011
Jan. 14, 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) 8,880,708 13,364,634 242,502    
Stock repurchase price per share (in dollars per share) $ 22.51 $ 20.42 $ 18.38    
Number of shares repurchased under the program 49,786,782        
Number of shares available for repurchase under Stock Repurchase Program 48,213,218        
Purchase of common shares from tender offer         21,052,630
Tender price to purchase common shares         $ 19.00
Number of shares accepted for purchase under tender offer         24,344,176
Additional purchase of common shares from tender offer         3,291,546
Threshold limit for purchase of company's additional shares         2.00%
Dilutive earnings per share, Impact of repurchase shares on the weighted average common shares outstanding (in dollars per share) $ 0.04        
Remittance to taxing authorities under statutory withholding in fiscal year 2011 and 2012 $ 2.6 $ 4.2 $ 7.4