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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
May 02, 2021 | May 03, 2020
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 | $ 19,400,000 |
Operating loss carryforwards, related future tax benefits | $ 4,100,000 |
U.S. Federal Tax Authorities [Member] | Earliest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carry forwards Expiration Year | 2027 |
U.S. Federal Tax Authorities [Member] | Latest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carry forwards Expiration Year | 2038 |
U.S. State and Local Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carryforwards | $ 28,900,000 |
Operating loss carryforwards, related future tax benefits | $ 953,000 |
U.S. State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carry forwards Expiration Year | 2022 |
U.S. State and Local Jurisdiction [Member] | Latest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carry forwards Expiration Year | 2040 |

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