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Income Taxes - Effective Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 02, 2020 | Apr. 27, 2019 | Apr. 28, 2018
Income Tax Disclosure [Abstract] |  |  |
Computed income tax (benefit) expense at federal statutory rates | $ (2) | $ (1,038) | $ 3,779
Change in uncertain tax positions | 4 | (2,600) | 65
Research and development tax credit | (1,621) | (1,278) | (1,598)
Other, net | (241) | 587 | 559
Change in valuation allowances | 482 | (471) | (486)
GILTI | 149 | 391 | 0
Base Erosion Anti-Abuse Tax (BEAT) | 301 | 0 | 0
Stock compensation | 318 | 308 | 336
Meals and entertainment | 305 | 248 | 333
Dividends paid to retirement plan | (111) | (158) | (238)
State taxes, net of federal benefit | (84) | 25 | 592
Impact of Tax Act | 0 | 0 | 3,819
Domestic production activities deduction | 0 | 0 | (294)
Income tax (benefit) expense | $ (500) | $ (3,986) | $ 6,867

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