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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. 27, 2018	Jul. 28, 2017
Net income per share:
Net income	$ 283	$ 131
Shares used in basic computation	262	270
Dilutive impact of employee equity award plans	7	8
Shares used in diluted computation	269	278
Basic	$ 1.08	$ 0.49
Diluted	$ 1.05	$ 0.47

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