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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 | Jul. 31, 2020 | Apr. 24, 2020
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Long | Cash Flow Hedges |  |
Derivative [Line Items] |  |
Forward contracts, Notional Amount | $ 123 | $ 124
Non Designated | Long | Balance Sheet Contracts |  |
Derivative [Line Items] |  |
Forward contracts, Notional Amount | 94 | 108
Non Designated | Short | Balance Sheet Contracts |  |
Derivative [Line Items] |  |
Forward contracts, Notional Amount | $ 339 | $ 254

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