General and Summary of Significant Accounting Policies - Summary of Foreign Currency Exchange (Losses) Gains by Geographic Area (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 02, 2021	May 03, 2020	Apr. 28, 2019
Foreign Currency Exchange Gain And Loss [Line Items]
Foreign currency exchange gains (losses)	$ (1,411)	$ (96)	$ (62)
China [Member]
Foreign Currency Exchange Gain And Loss [Line Items]
Foreign currency exchange gains (losses)	(1,389)	42
Canada [Member]
Foreign Currency Exchange Gain And Loss [Line Items]
Foreign currency exchange gains (losses)	$ (22)	$ (138)	2
Europe [Member]
Foreign Currency Exchange Gain And Loss [Line Items]
Foreign currency exchange gains (losses)			$ (64)