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Shareholders' Equity and Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2016
May 02, 2015
Apr. 26, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 2,958 $ 3,038 $ 2,897
Cost of goods sold      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 751 737 657
Selling      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 780 825 810
General and administrative      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 839 908 859
Product design and development      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 588 $ 568 $ 571