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Long-Lived Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Apr. 27, 2013	Apr. 28, 2012
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 1,502	$ 1,274
Indefinite-lived assets	401	401
Definite-lived and Indefinite lived, Gross Carrying Amount	2,683	2,683
Intangibles, net	1,181	1,409
Patents
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]
Definite-lived, Gross Carrying Amount	2,282	2,282
Accumulated Amortization	1,502	1,274
Definite-lived, Net Value	$ 780	$ 1,008

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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