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Stockholders' Equity (Schedule Of Employee Stock Purchase Plan (ESPP) Disclosures) (Details) (Employee Stock Purchase Plan [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Apr. 27, 2012
Apr. 29, 2011
Apr. 30, 2010
Employee Stock Purchase Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value per right granted $ 12.87 $ 15.86 $ 8.86
Shares issued under the ESPP 2.6 6.0 5.1
Weighted-average price per share issued $ 34.53 $ 11.50 $ 10.49