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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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