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Supplemental Financial Information - Inventories (Detail) - USD ($) $ in Millions	Jan. 24, 2020	Apr. 26, 2019
Inventory Disclosure [Abstract]
Purchased components	$ 18	$ 8
Finished goods	95	123
Inventories	$ 113	$ 131

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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