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Stock Purchase and Award Plans, Restricted Stock Award Activity (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Apr. 27, 2012
Apr. 29, 2011
Apr. 30, 2010
Restricted Stock Award Activity (per share)      
Weighted average period over which unrecognized compensation is expected to be recognized 1 year 1 month    
Restricted Stock Awards
     
Restricted Stock Award Activity (in shares)      
Nonvested, beginning balance 9,207 8,909 8,346
Granted 3,785 2,682 2,783
Vested (2,194) (1,809) (1,632)
Forfeited (818) (575) (588)
Nonvested at year-end 9,980 9,207 8,909
Restricted Stock Award Activity (per share)      
Nonvested, beginning balance $ 40.42 $ 42.67 $ 43.88
Granted $ 35.60 $ 37.52 $ 34.92
Vested $ 44.74 $ 47.28 $ 35.36
Forfeited $ 38.46 $ 40.12 $ 43.52
Nonvested at year-end $ 37.80 $ 40.42 $ 42.67
Unrecognized compensation expense related to restricted stock awards $ 155    
Weighted average period over which unrecognized compensation is expected to be recognized 2 years 8 months