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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($) | 12 Months Ended |
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Apr. 30, 2023 | May 01, 2022
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 | $ 48,200,000 |
Operating loss carryforwards, related future tax benefits | 10,100,000 |
U.S. State and Local Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carryforwards | 27,200,000 |
Operating loss carryforwards, related future tax benefits | $ 1,000,000.0 |
U.S. State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carry forwards Expiration Year | 2024 |
U.S. State and Local Jurisdiction [Member] | Latest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carry forwards Expiration Year | 2044 |
U.S. Foreign [Member] | Earliest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carry forwards Expiration Year | 2026 |
U.S. Foreign [Member] | Latest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carry forwards Expiration Year | 2028 |

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