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Stockholders' Equity - Activity Related to Stock Options (Detail) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Oct. 26, 2018 USD ($) $ / shares shares
Number of Shares
Beginning balance, Number of Shares | shares	1
Ending balance, Number of Shares | shares	1
Options Exercisable, Number of Shares | shares	1
Weighted-Average Exercise Price
Beginning balance, Weighted-Average Exercise Price | $ / shares	$ 31.19
Ending balance, Weighted-Average Exercise Price | $ / shares	30.49
Options Exercisable, Weighted-Average Exercise Price | $ / shares	$ 32.21
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value
Outstanding, Weighted-Average Remaining Contractual Term	3 years 3 months 7 days
Exercisable, Weighted-Average Remaining Contractual Term	2 years 11 months 1 day
Outstanding, Aggregate Intrinsic Value | $	$ 29
Exercisable, Aggregate Intrinsic Value | $	$ 25

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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