Share-Based Compensation - Expense (Details) (USD $)	3 Months Ended				9 Months Ended
	Jun. 28, 2014	Dec. 28, 2013	Jun. 29, 2013	Dec. 29, 2012	Dec. 28, 2013
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	451,400		611,500
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	230,000
Total share-based compensation expense		$ 1,330,000		$ 2,634,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition					2 years 3 months 12 days
Cost of Sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total share-based compensation expense		169,000		185,000
Selling, General and Administrative Expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total share-based compensation expense		865,000		2,094,000
Research and Development Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Total share-based compensation expense		296,000		355,000
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		$ 7,400,000			$ 7,400,000