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Net Income per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jan. 29, 2016
Jan. 23, 2015
Jan. 29, 2016
Jan. 23, 2015
Net income per share:        
Net income $ 153 $ 177 $ 237 $ 425
Shares used in basic computation 293 312 297 318
Dilutive impact of employee equity award plans 3 5 3 5
Shares used in diluted computation 296 317 300 323
Basic $ 0.52 $ 0.57 $ 0.80 $ 1.34
Diluted $ 0.52 $ 0.56 $ 0.79 $ 1.31