Goodwill - Summary of Change in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 03, 2020		Apr. 28, 2019		Apr. 29, 2018
Goodwill [Line Items]
beginning balance	$ 27,222	[1]	$ 13,569		$ 11,462
acquisition of assets (notes 2 and 3)			13,653		2,107
ending balance			$ 27,222	[1]	$ 13,569
Continuing Operation [Member]
Goodwill [Line Items]
loss on impairment	(13,569)
Discontinued Operations [Member]
Goodwill [Line Items]
loss on impairment	$ (13,653)

[1] At April 28, 2019, goodwill totaled $27.2 million, of which $13.6 million was classified as goodwill and $13.6 million was classified within noncurrent assets held for sale – discontinued operation, respectively, in the accompanying Consolidated Balance Sheet.