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Nature of Business and Summary of Significant Accounting Policies - Advertising Costs (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Apr. 28, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Advertising expense $ 1,694 $ 1,584 $ 1,843