Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
	May 02, 2021	May 03, 2020
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	$ 19,400,000
Operating loss carryforwards, related future tax benefits	$ 4,100,000
U.S. Federal Tax Authorities [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Operating Loss Carry forwards Expiration Year	2027
U.S. Federal Tax Authorities [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Operating Loss Carry forwards Expiration Year	2038
U.S. State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 28,900,000
Operating loss carryforwards, related future tax benefits	$ 953,000
U.S. State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Operating Loss Carry forwards Expiration Year	2022
U.S. State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Operating Loss Carry forwards Expiration Year	2040