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Shareholders' Equity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Apr. 26, 2013
Apr. 27, 2012
Jun. 20, 2013
Jun. 30, 2011
Equity, Class of Treasury Stock [Line Items]        
Number of common stock authorized to be repurchased (in shares)     80 75
Shares repurchased (in shares) 31.2 37.3    
Average repurchase price (per share) $ 39.97 $ 38.64    
June 2011 Share Repurchase Program
       
Equity, Class of Treasury Stock [Line Items]        
Shares repurchased (in shares) 47.8      
Shares available for future repurchases (in shares) 27.2