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Long-Lived Assets - Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Life (in years) 13 years  
Gross Carrying Amount $ 4,146 $ 2,282
Accumulated Amortization 1,867 1,502
Definite-lived, Net Value 2,279 780
Indefinite-lived assets 401 401
Definite-lived and Indefinite lived, Gross Carrying Amount 4,547 2,683
Intangibles, net 2,680 1,181
Patents
    
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Life (in years) 10 years  
Gross Carrying Amount 2,282 2,282
Accumulated Amortization 1,730 1,502
Definite-lived, Net Value 552 780
Trademarks
    
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Life (in years) 20 years  
Gross Carrying Amount 1,216 0
Accumulated Amortization 59 0
Definite-lived, Net Value 1,157 0
Other
    
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Life (in years) 9 years  
Gross Carrying Amount 648 0
Accumulated Amortization 78 0
Definite-lived, Net Value $ 570 $ 0