Stock-Based Compensation (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended
Mar. 13, 2012
Oct. 27, 2012
Jul. 28, 2012
May 18, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       7,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   6,000,000    
Granted, Stock Options 1,900,000 80,000 704,000  
Granted, Weighted-Average Exercise Price Per Share $ 37.63 $ 22.98 $ 26.29  
Grants of stock options - fair value per option $ 11.68 $ 10.11 $ 11.36  
Granted, Stock Awards 646,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 37.63      
Total Stock Awards [Member]
       
Granted, Stock Awards     690,000  
Director [Member]
       
Granted, Stock Awards     50,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 27.26  
Employee [Member]
       
Granted, Stock Awards   390,000 640,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 22.98 $ 26.29  
Newly Authorized Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       1,500,000
Reserved But Unissued Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       5,500,000