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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	May 01, 2021	May 02, 2020
Income Tax Disclosure [Abstract]
Computed income tax expense (benefit) at federal statutory rates	$ 233	$ 2,953	$ (2)
Change in uncertain tax positions	(71)	(34)	4
Research and development tax credit	(382)	(1,047)	(1,621)
Other, net	(227)	403	(241)
Change in valuation allowances	609	402	482
GILTI	(14)	(156)	149
Base Erosion Anti-Abuse Tax (BEAT)	12	(285)	301
Stock compensation	150	355	318
Meals and entertainment	67	49	305
Dividends paid to retirement plan	0	0	(111)
State taxes, net of federal benefit	139	494	(84)
Effective income tax rate reconciliation	$ 516	$ 3,134	$ (500)

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Effective Income Tax Rate Reconciliation, Global Intangible Low-Taxed Income, Amount

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for dividend paid to employee stock ownership plan.

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-Section 50
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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