Net Income per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Apr. 28, 2017	Apr. 29, 2016	Apr. 24, 2015
Net income per share:
Net income	$ 509	$ 229	$ 560
Shares used in basic computation	275	294	316
Dilutive impact of employee equity award plans	6	3	5
Shares used in diluted computation	281	297	321
Basic	$ 1.85	$ 0.78	$ 1.77
Diluted	$ 1.81	$ 0.77	$ 1.75