Income Taxes - Summary of Change in Valuation Allowances Against Deferred Income Taxes (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 03, 2020	Apr. 28, 2019	Apr. 29, 2018
Valuation Allowance [Line Items]
Establishment of a valuation allowance associated with U.S. foreign tax credits				$ 4,600
Write-off of deferred income taxes	[1]		$ (4,544)
income tax expense (benefit)	[2]	$ 2,400	$ (4,456)	$ 116
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 2018, we recorded an income tax charge of $4.6 million for the establishment of a valuation allowance associated with U.S. foreign tax credits that we believed were not more-likely-than not to be realized based on the provisions outlined in TCJA. During fiscal 2019, we recorded an income tax charge of $4.5 million for the write-off of certain U.S. foreign tax credits, and in turn, we recorded an income tax benefit of $4.5 million for the reduction in our valuation allowance.

[2] The income tax benefit of $6,903 recorded during fiscal 2018 included a charge of $4,550 for the establishment of a valuation allowance against U.S. foreign tax credits that were not more-likely-than not to be realized as a result of the 2017 Tax Cuts and Jobs Act. During fiscal 2019, we recorded an income tax charge of $4.5 million for the write-off of certain U.S. foreign tax credits, and in turn, we recorded an income tax benefit of $4.5 million for the reduction in our valuation allowance. The $4.5 million income charge for the write-off of certain U.S. foreign tax credits is included in the undistributed earnings – foreign subsidiaries income tax expense amount of $3,735.