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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($) | May 02, 2021 | May 03, 2020 | Apr. 28, 2019 | Apr. 29, 2018
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Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | $ 1,444,000 | $ 1,269,000 | $ 903,000 | $ 844,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized | 1,100,000 | 1,300,000 |  |
Gross amount of interest and penalties due to unrecognized tax benefits | 165,000 | 103,000 |  |
Non-current Deferred Income Taxes [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | 380,000 |  |  |
Income Taxes Payable - Long-Term [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | $ 1,100,000 | $ 1,300,000 |  |

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