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
	Jul. 31, 2020	Jul. 26, 2019
Net income per share:
Net income	$ 77	$ 103
Shares used in basic computation	221	239
Dilutive impact of employee equity award plans	1	4
Shares used in diluted computation	222	243
Basic	$ 0.35	$ 0.43
Diluted	$ 0.35	$ 0.42