Stockholders' Equity - Summary of Activities Related to Dividends on Common Stock (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Apr. 29, 2016	Apr. 24, 2015	Apr. 25, 2014
Dividends, Common Stock [Abstract]
Dividends per share declared	$ 0.72	$ 0.66	$ 0.60
Dividend payments	$ 210	$ 208	$ 202
Additional Paid-in Capital
Dividends, Common Stock [Abstract]
Dividend payments	125	52	50
Retained Earnings
Dividends, Common Stock [Abstract]
Dividend payments	$ 85	$ 156	$ 152