Stockholders' Equity - Summary of Activities Related to Dividends on Common Stock (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Dividends, Common Stock [Abstract]
Dividends per share declared	$ 1.60	$ 0.80	$ 0.76
Dividend payments	$ 403	$ 214	$ 208
Additional Paid-in Capital
Dividends, Common Stock [Abstract]
Dividend payments	$ 403	106	88
Retained Earnings (Accumulated Deficit)
Dividends, Common Stock [Abstract]
Dividend payments		$ 108	$ 120