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Common Stock Repurchases (Details Textuals) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jul. 31, 2011
Sep. 22, 2011
Jan. 14, 2011
Stock Repurchase [Abstract]          
Additional Common stock authorized for repurchase (in shares)       20,000,000  
Common stock authorized for repurchase (in shares)       49,000,000  
Company repurchased common stock (in shares) 3,040,354 2,249,826      
Stock repurchase price per share (in dollars per share) $ 44.36 $ 33.65      
Total Company repurchased common stock $ 134.9 $ 75.7      
Number of shares repurchased under the program 23,493,391        
Number of shares available for repurchase under Stock Repurchase Program 25,506,609        
Purchase of common shares from tender offer         10,526,315
Tender price to purchase common shares (in dollars per share)         $ 38.00
Number of shares accepted for purchase under tender offer         12,172,088
Additional purchase of common shares from tender offer         1,645,773
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) $ 0.02        
Remittance to taxing authorities under statutory withholding in fiscal year 2011 and 2012 $ 0.3   $ 4.2