Goodwill and Purchased Intangible Assets, Net - Purchased Intangible Assets, Net (Detail) - USD ($) $ in Millions	Jul. 28, 2017	Apr. 28, 2017
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	$ 206	$ 200
Accumulated Amortization	(82)	(69)
Net Assets	124	131
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	154	148
Accumulated Amortization	(52)	(44)
Net Assets	102	104
Customer Contracts/Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	43	43
Accumulated Amortization	(23)	(19)
Net Assets	20	24
Other Purchased Intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	9	9
Accumulated Amortization	(7)	(6)
Net Assets	$ 2	$ 3