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Income Taxes - Effective Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 28, 2018 | Jan. 27, 2018 | Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Computed income tax expense at federal, state and local jurisdiction statutory rates |  |  | $ 3,779 | $ 5,456 | $ 1,063
Impact of Tax Act | $ (461) | $ 4,280 | 3,819 | 0 | 0
Research and development tax credit |  |  | 1,598 | 1,573 | 2,015
State taxes, net of federal benefit |  |  | 592 | 539 | 40
Other, net |  |  | 559 | 378 | 142
Change in valuation allowances |  |  | (486) | 388 | 1,265
Stock compensation |  |  | 336 | 497 | 525
Meals and entertainment |  |  | 333 | 299 | 334
Domestic production activities deduction |  |  | (294) | (542) | (91)
Dividends paid to retirement plan |  |  | (238) | (293) | (323)
Change in uncertain tax positions |  |  | 65 | 97 | 125
Income tax expense |  |  | $ 6,867 | $ 5,246 | $ 1,065

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