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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Jul. 29, 2016	Jul. 31, 2015	Apr. 29, 2016	Apr. 24, 2015
Income Tax Contingency [Line Items]
Provision for income taxes	$ 28	$ 8
Gross unrecognized tax benefits	218	243	$ 216	$ 272
Unrecognized tax benefits included in other long-term liabilities	149
Unrecognized tax benefits that would affect provision for income taxes	154
Federal Income Tax
Income Tax Contingency [Line Items]
Resolution of income tax examinations		$ 13
Accounting Standards Update 2016-09
Income Tax Contingency [Line Items]
Provision for income taxes	$ 13

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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Amount recognized for uncertainty in income taxes classified as noncurrent.

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Amount of unrecognized tax benefits.

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