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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2023	May 01, 2022
Income Taxes [Line Items]
foreign income tax credits - U.S.	$ 783,000	$ 783,000
U.S. foreign income tax credits, expiration period	10 years
U.S. Federal Tax Authorities [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 48,200,000
Operating loss carryforwards, related future tax benefits	10,100,000
U.S. State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	27,200,000
Operating loss carryforwards, related future tax benefits	$ 1,000,000.0
U.S. State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Operating Loss Carry forwards Expiration Year	2024
U.S. State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Operating Loss Carry forwards Expiration Year	2044
U.S. Foreign [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Operating Loss Carry forwards Expiration Year	2026
U.S. Foreign [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Operating Loss Carry forwards Expiration Year	2028

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