Income Taxes - Summary of Deferred Tax Assets Associated with Loss Carryforwards (Details) $ in Thousands	Apr. 25, 2020 USD ($)
Income Tax Disclosure [Abstract]
Federal net operating losses	$ 1,663
Various U.S. state net operating losses (excluding federal tax effect)	3,892
Foreign capital losses	$ 17

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 20
-Subparagraph (b)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant