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Derivatives and Hedging Activities - Schedule of Notional Value of Outstanding Foreign Currency Forward Contracts (Detail) - Foreign Exchange Forward Contracts - USD ($) $ in Millions | Jan. 24, 2020 | Apr. 26, 2019
--- | --- | ---
Long | Cash Flow Hedges |  |
Derivative [Line Items] |  |
Forward contracts, Notional Amount | $ 171 | $ 103
Non Designated | Long | Balance Sheet Contracts |  |
Derivative [Line Items] |  |
Forward contracts, Notional Amount | 221 | 363
Non Designated | Short | Balance Sheet Contracts |  |
Derivative [Line Items] |  |
Forward contracts, Notional Amount | $ 60 | $ 121

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