Derivatives and Hedging Activities - Schedule of Notional Value of Outstanding Foreign Currency Forward Contracts (Detail) - United States of America, Dollars - USD ($) $ in Millions	Apr. 29, 2016	Apr. 24, 2015
Cash Flow Hedging | Long
Derivative [Line Items]
Forward contracts, Notional Amount	$ 99	$ 94
Non Designated | Long
Derivative [Line Items]
Forward contracts, Notional Amount	396	231
Non Designated | Short
Derivative [Line Items]
Forward contracts, Notional Amount	$ 160	$ 160