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Income Taxes - Effective Income Tax (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Income Tax Disclosure [Abstract]
Computed income tax expense at federal statutory rate	$ 13,035	$ 10,825	$ 4,052
State taxes, net of federal benefit	1,433	684	497
Research and development tax credit	(750)	(1,804)	(1,004)
Meals and entertainment	344	308	375
Stock compensation	586	466	842
Dividends paid to retirement plan	(328)	(616)	(522)
Domestic production activities deduction	(1,012)	(976)	(270)
Change in foreign deferred rates	0	0	(249)
Change in valuation allowances	2,301	0	(364)
Other, net	(574)	(737)	(269)
Income tax expense	$ 15,035	$ 8,150	$ 3,088

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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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