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Income Taxes - Effective Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 29, 2017 | Apr. 30, 2016 | May 02, 2015
Income Tax Disclosure [Abstract] |  |  |
Computed income tax expense at federal, state and local jurisdiction statutory rates | $ 5,456 | $ 1,063 | $ 11,089
State taxes, net of federal benefit | 539 | 40 | 1,016
Research and development tax credit | (1,573) | (2,015) | (1,292)
Meals and entertainment | 299 | 334 | 369
Stock compensation | 497 | 525 | 566
Dividends paid to retirement plan | (293) | (323) | (352)
Domestic production activities deduction | (542) | (91) | (529)
Change in valuation allowances | 388 | 1,265 | (2,295)
Change in uncertain tax positions | 97 | 125 | 2,357
Other, net | 378 | 142 | (128)
Income tax expense | $ 5,246 | $ 1,065 | $ 10,801

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