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Business Combination (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jul. 27, 2013
Business Combination, Recognized Goodwill [Abstract]  
Goodwill, Acquired During Period $ 1,300
Trade Names [Member]
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Acquired Finite-lived Intangible Asset, Amount 1,151
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 20 years
Customer Lists [Member]
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Acquired Finite-lived Intangible Asset, Amount $ 615
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 9 years