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Stockholders' Equity (Activity Related To Restricted Stock Units (RSUs)) (Details) (Restricted Stock Units [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Apr. 27, 2012
Apr. 29, 2011
Apr. 30, 2010
Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance, Number of Shares 10.1 9.0 5.5
Beginning balance, Weighted-Average Exercise Price $ 35.79 $ 23.92 $ 22.38
RSUs granted, Number of Shares 6.5 4.7 3.1
RSUs granted, Weighted-Average Grant Date Fair Value $ 47.17 $ 49.13 $ 29.32
RSUs issued in the Exchange, Number of Shares     3.2
RSUs issued in the Exchange, Weighted-Average Grant Date Fair Value     $ 21.73
RSUs vested, Number of Shares (3.7) (2.9) (2.1)
RSUs vested, Weighted-Average Grant Date Fair Value $ 30.35 $ 22.52 $ 24.64
RSUs forfeitures and cancellations, Number of Shares (0.9) (0.7) (0.7)
RSUs forfeitures and cancellations, Weighted-Average Grant Date Fair Value $ 40.91 $ 27.57 $ 23.39
Ending balance, Number of Shares 12.0 10.1 9.0
Ending balance, Weighted-Average Exercise Price $ 43.28 $ 35.79 $ 23.92