Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 29, 2016	Apr. 24, 2015	Apr. 25, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (24)	$ 9
OCI before reclassifications, net of tax	(9)	(19)
Amounts reclassified from AOCI, net of tax	2	(14)
Other comprehensive loss	(7)	(33)	$ 0
Ending balance	(31)	(24)	9
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(23)	5
OCI before reclassifications, net of tax	4	(28)
Amounts reclassified from AOCI, net of tax	0	0
Other comprehensive loss	4	(28)
Ending balance	(19)	(23)	5
Defined Benefit Obligation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(13)	(5)
OCI before reclassifications, net of tax	(5)	(8)
Amounts reclassified from AOCI, net of tax	2	0
Other comprehensive loss	(3)	(8)
Ending balance	(16)	(13)	(5)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	11	9
OCI before reclassifications, net of tax	(4)	2
Amounts reclassified from AOCI, net of tax	(1)	0
Other comprehensive loss	(5)	2
Ending balance	6	11	9
Unrealized Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1	0
OCI before reclassifications, net of tax	(4)	15
Amounts reclassified from AOCI, net of tax	1	(14)
Other comprehensive loss	(3)	1
Ending balance	$ (2)	$ 1	$ 0