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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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