Commitments and Contingencies - Additional Information (Detail) - USD ($)	6 Months Ended
	Oct. 30, 2015	Oct. 24, 2014	Apr. 24, 2015
Commitments and Contingencies Disclosure [Line Items]
Future annual minimum lease payments	$ 204,000,000
Accrued purchase commitments with contract manufacturers	12,000,000		$ 17,000,000
Sale of finance receivables	72,000,000	$ 89,000,000
Legal proceedings and claims	$ 0
Maximum
Commitments and Contingencies Disclosure [Line Items]
Terms of recourse leases	3 years
Inventory
Commitments and Contingencies Disclosure [Line Items]
Purchase orders and other commitments	$ 262,000,000
Construction Related
Commitments and Contingencies Disclosure [Line Items]
Purchase orders and other commitments	36,000,000
Other
Commitments and Contingencies Disclosure [Line Items]
Purchase orders and other commitments	$ 172,000,000