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Supplemental Financial Information (Schedule Of Customer Concentration of Risk) (Details) - customer
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Dec. 31, 2016
Sales Revenue, Resale of Products          
Concentration Risk          
Concentration Risk, Percentage 91.00% 34.00% 91.00% 21.00%  
Customer Concentration Risk | Sales Revenue, Product Line | Customer A          
Concentration Risk          
Concentration Risk, Percentage       12.00%  
Customer Concentration Risk | Sales Revenue, Product Line | Customer B          
Concentration Risk          
Concentration Risk, Percentage   47.00%   35.00%  
Customer Concentration Risk | Sales Revenue, Product Line | Customer C          
Concentration Risk          
Concentration Risk, Percentage     11.00%    
Customer Concentration Risk | Sales Revenue, Product Line | Customer D          
Concentration Risk          
Concentration Risk, Percentage 16.00%        
Customer Concentration Risk | Sales Revenue, Product Line | Customer E          
Concentration Risk          
Concentration Risk, Percentage   11.00%      
Customer Concentration Risk | Accounts Receivable          
Concentration Risk          
Concentration Risk, Percentage     33.00%    
Concentration Risk, Number of Customers     1   2
Customer Concentration Risk | Accounts Receivable | Customer A          
Concentration Risk          
Concentration Risk, Percentage         27.00%
Customer Concentration Risk | Accounts Receivable | Customer B          
Concentration Risk          
Concentration Risk, Percentage         11.00%