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Share-Based Compensation - Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 15, 2015
Jun. 27, 2015
Jun. 28, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   613,700 451,400
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   467,000 230,000
Total share-based compensation expense   $ 1,063 $ 1,330
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   2 years  
Value of shares grant as compensation $ 2,000 $ 324  
Cost of Sales      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs      
Total share-based compensation expense   129 169
Selling, General and Administrative Expenses      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs      
Total share-based compensation expense   715 865
Research and Development Expense      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs      
Total share-based compensation expense   219 $ 296
Stock Options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 10,200