Income Taxes - Summary of Valuation Allowances Against Net Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Jan. 31, 2021	May 03, 2020	Feb. 02, 2020
Valuation Allowance [Line Items]
Valuation allowance	$ 10,825	$ 3,148	$ 711
Capital Loss Carry Forwards and Credits [Member]
Valuation Allowance [Line Items]
Valuation allowance	2,281	2,281
U.S. Federal and State [Member] \| Deferred Income Tax Assets [Member]
Valuation Allowance [Line Items]
Valuation allowance	$ 8,544	$ 867	$ 711

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 http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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