Goodwill - Summary of Change in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
May 03, 2020	Apr. 28, 2019
Goodwill [Line Items]
beginning balance	$ 27,222	$ 13,569
business combination (note 3)		13,653
ending balance		$ 27,222
Continuing Operations [Member]
Goodwill [Line Items]
loss on impairment	(13,569)
Discontinued Operations [Member]
Goodwill [Line Items]
loss on impairment	$ (13,653)

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration