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Income Taxes - Effective Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	May 02, 2015	Apr. 26, 2014
Income Tax Disclosure [Abstract]
Computed income tax expense at federal, state and local jurisdiction statutory rates	$ 1,063	$ 11,089	$ 13,035
State taxes, net of federal benefit	40	1,016	1,433
Research and development tax credit	(2,015)	(1,292)	(750)
Meals and entertainment	334	369	344
Stock compensation	525	566	586
Dividends paid to retirement plan	(323)	(352)	(328)
Domestic production activities deduction	(91)	(529)	(1,012)
Change in valuation allowances	1,265	(2,295)	2,301
Change in uncertain tax positions	125	2,357	111
Other, net	142	(128)	(685)
Income tax expense	$ 1,065	$ 10,801	$ 15,035

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