Income Taxes - Summary of Change in Valuation Allowances Against Deferred Income Taxes (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 02, 2021	May 03, 2020	Apr. 28, 2019
Valuation Allowance [Line Items]
Write-off of deferred income taxes	[1]			$ (4,544)
income tax expense (benefit)		$ 8,526	$ 119	$ (4,456)
U.S. Federal Tax Authorities [Member]
Valuation Allowance [Line Items]
Capital loss carryforwards		10,900
Capital loss carryforward, related future tax benefits		$ 2,300

[1] During fiscal 2019, we recorded an income tax charge of $4.5 million for the write-off of certain U.S. foreign income tax credits, and in turn, we recorded an income tax benefit of $4.5 million for the reduction in our valuation allowance.