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Income Taxes - Effective Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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May. 02, 2015 | Apr. 26, 2014 | Apr. 27, 2013
Income Tax Disclosure [Abstract] |  |  |
Computed income tax expense (benefit) at federal, state and local jurisdiction statutory rates | $ 11,089 | $ 13,035 | $ 10,825
State taxes, net federal benefit | 1,016 | 1,433 | 684
Research and development tax credit | (1,292) | (750) | (1,804)
Meals and entertainment | 369 | 344 | 308
Stock compensation | 566 | 586 | 466
Dividends paid to retirement plan | (352) | (328) | (616)
Domestic production activities deduction | (529) | (1,012) | (976)
Change in valuation allowances | (2,295) | 2,301 | 0
Change in uncertain tax positions | 2,357 | 111 | (70)
Other, net | (128) | (685) | (667)
Income tax expense | $ 10,801 | $ 15,035 | $ 8,150

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