Income Taxes - 2017 Tax Cuts and Jobs Act - Narrative (Detail) - USD ($) $ in Thousands	12 Months Ended
Apr. 28, 2019	Apr. 29, 2018	Apr. 30, 2017
Income Taxes [Line Items]
Federal statutory income tax rate	21.00%	30.40%	34.00%
Provisional income tax (benefit) expense Transition Tax	$ (282)	$ (4,300)
Provisional income tax (benefit) expense for re-measurement of U.S. deferred income taxes	(268)	2,200
Provisional benefit for release of deferred income tax liabilities related to earnings and profits not permanently reinvested		18,000
Provisional benefit for reduction in U.S. Federal income tax rate pursuant to the Tax Act on effective settlement of IRS exam		11,700
Provisional charge for write-off and establishment of valuation allowance against unused foreign tax credits		25,400
Two Thousand Seventeen Tax Cuts and Jobs Act [Member] \| Foreign Earnings And Profits [Member]
Income Taxes [Line Items]
Provisional income tax benefits associated with Transition Tax		$ 4,300
GILTI [Member]
Income Taxes [Line Items]
Income tax charge of during period	$ 2,100

Income Taxes [Line Items]

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Amount of reasonable estimate for income tax expense (benefit) for which accounting for tax effect for remeasurement of deferred tax from change in tax rate is incomplete pursuant to Tax Cuts and Jobs Act.

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Amount of reasonable estimate for income tax expense (benefit) for which accounting for tax effect is incomplete pursuant to Tax Cuts and Jobs Act.

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Amount of reasonable estimate for income tax benefit from release of deferred income tax liabilities related to earnings and profits not permanently reinvested pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Amount of reasonable estimate for income tax benefit from reduction in U.S. Federal income tax rate pursuant to the transition tax of the Tax Cuts and Jobs Act of 2017 on the effective settlement of an income tax examination.

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Amount of reasonable estimate for income tax expense (benefit) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Amount of reasonable estimate for income tax expense from write-off and establishment of valuation allowance against unused foreign tax credits pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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