Balance Sheet Details - Product Warranty Liabilities (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 28, 2016	Oct. 30, 2015	Oct. 28, 2016	Oct. 30, 2015	Oct. 28, 2016	Apr. 29, 2016
Movement In Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 61	$ 81	$ 70	$ 86
Expense accrued during the period	1	13	5	22
Warranty costs incurred	(8)	(14)	(21)	(28)
Balance at end of period	54	80	54	80
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]
Accrued expenses					$ 36	$ 48
Other long-term liabilities					18	22
Total warranty liabilities	$ 61	$ 81	$ 70	$ 86	$ 54	$ 70