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Stock-based Compensation (Schedule of Allocated Employee Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation $ 23,938 $ 22,912 $ 21,977
Research and development expense [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation 7,569 9,366 11,691
Selling, general and administrative expense [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation $ 16,369 $ 13,546 $ 10,286