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Shareholders' Equity and Share-Based Compensation - Share-Based Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Apr. 28, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 2,897 $ 3,037 $ 3,262
Cost of goods sold
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 657 633 610
Selling
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 810 856 982
General and administrative
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 859 980 1,059
Product design and development
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 571 $ 568 $ 611