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Income Taxes - Additional Information (Detail) - USD ($)		12 Months Ended
	Mar. 27, 2020	Apr. 30, 2022	Apr. 30, 2021
Income Taxes [Line Items]
CARES Act, NOL carryback period (in years)	5 years
Tax expense related to GILTI		$ 0	$ 0
Deferred tax assets		11,462,000	5,754,000
Deferred tax asset valuation allowance		6,901,000	2,731,000
Foreign tax credit carryforwards		$ 638,000	638,000
Minimum
Income Taxes [Line Items]
Federal, state and local tax returns period (in years)		3 years
Foreign subsidiaries tax returns period (in years)		3 years
Maximum
Income Taxes [Line Items]
Federal, state and local tax returns period (in years)		4 years
Foreign subsidiaries tax returns period (in years)		7 years
India Income Tax Department
Income Taxes [Line Items]
Tax withholding expense		$ 240,000	$ 226,000

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-Publisher FASB
-Name Accounting Standards Codification
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