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. 27, 2017	Jan. 29, 2016	Jan. 27, 2017	Jan. 29, 2016
Net income per share:
Net income	$ 146	$ 153	$ 319	$ 237
Shares used in basic computation	274	293	277	297
Dilutive impact of employee equity award plans	7	3	5	3
Shares used in diluted computation	281	296	282	300
Basic	$ 0.53	$ 0.52	$ 1.15	$ 0.80
Diluted	$ 0.52	$ 0.52	$ 1.13	$ 0.79