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Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amount reclassified to retained earnings for equity unrealized gain (adoption of ASU 2016-01)   $ 0 $ 0
Unrealized Gains On Available-For-Sale Marketable Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income balance, beginning balance $ 262 5,880  
Amount reclassified to retained earnings for equity unrealized gain (adoption of ASU 2016-01)   (5,481)  
Other comprehensive income (loss) before reclassifications 1,255 (177)  
Amounts reclassified from accumulated other comprehensive income (37) 40  
Net current period change in other comprehensive income 1,218 (5,618)  
Accumulated other comprehensive income balance, ending balance $ 1,480 $ 262