Income Taxes - Summary of Valuation Allowances Against Net Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	May 01, 2022	Aug. 01, 2021
Valuation Allowance [Line Items]
Valuation allowance	$ 13,336	$ 11,857	$ 11,551
Capital Loss Carryforward [Member]
Valuation Allowance [Line Items]
Valuation allowance	2,330	2,330	2,330
U.S. Federal and State [Member] \| Deferred Income Tax Assets [Member]
Valuation Allowance [Line Items]
Valuation allowance	$ 11,006	$ 9,527	$ 9,221

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant