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Income Taxes - Additional Information (Detail) - USD ($)		12 Months Ended
	Mar. 27, 2020	Apr. 30, 2021	Apr. 30, 2020
Income Taxes [Line Items]
CARES Act, NOL carryback period (in years)	5 years
Tax expense related to GILTI		$ 0
Deferred tax assets		5,754,000	$ 6,293,000
Deferred tax asset valuation allowance		2,731,000	2,612,000
Federal research and development tax credit carryforward		808,000
Foreign tax credit carryforwards		638,000	638,000
Gross net operating losses		1,136,000
Gross net operating losses outside of United States, amount expiring		$ 482,000
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		$ 226,000	$ 1,964,000

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