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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 27, 2020 | Dec. 22, 2017 | Apr. 30, 2023 | Apr. 30, 2022
Income Taxes [Line Items] |  |  |  |
CARES Act, NOL carryback period (in years) | 5 years |  |  |
Section 174 expenditure deduction period |  | 5 years |  |
Deferred tax asset, Section 174 addback |  |  | $ 1,558 | $ 0
Deferred tax asset valuation allowance |  |  | 8,568 | 6,901
Foreign tax credit carryforwards |  |  | $ 638 | 638
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 |  |  | $ 406 | $ 240

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