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Stock Plans (Summary of Total Compensation Recognized Related to Outstanding Stock Options) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2017
Jan. 03, 2016
Dec. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense $ 17,158 $ 17,278 $ 14,057
Cost of sales [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense 1,031 1,272 1,380
Research and development expenses [Member ]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense 902 526 484
Selling, general and administrative and other expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense $ 15,225 $ 15,480 $ 12,193