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Stockholders' Equity - Summary of Activities Related to Dividends on Common Stock (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 28, 2017
Apr. 29, 2016
Apr. 24, 2015
Dividends, Common Stock [Abstract]      
Dividends per share declared $ 0.76 $ 0.72 $ 0.66
Dividend payments $ 208 $ 210 $ 208
Additional Paid-in Capital      
Dividends, Common Stock [Abstract]      
Dividend payments 88 125 52
Retained Earnings      
Dividends, Common Stock [Abstract]      
Dividend payments $ 120 $ 85 $ 156