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Income Taxes - Effective Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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