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Marketable Securities (Schedule Of Maturities of Marketable Securities) (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Marketable Securities [Abstract]    
Amortized Cost, Due within one year $ 7,347  
Fair Value, Due within one year 7,336  
Amortized Cost, Due after one year through five years 22,633  
Fair Value, Due after one year through five years 22,616  
Amortized Cost, Due after five years through ten years 17,675  
Fair Value, Due after five years through ten years 17,440  
Amortized Cost, Equity securities 1,198  
Fair Value, Equity securities 7,948  
Amortized Cost 48,853 $ 55,476
Available-for-sale Securities, Fair Value, Total $ 55,340 $ 63,665