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Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amount reclassified to retained earnings for equity unrealized gain (adoption of ASU 2016-01)   $ 0 $ 0
Unrealized Gain On Available-For-Sale Marketable Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income balance, beginning balance $ 5,880 4,852  
Amount reclassified to retained earnings for equity unrealized gain (adoption of ASU 2016-01) (5,481)    
Other comprehensive loss before reclassifications (177) (43)  
Accumulated change in effective tax rate   1,042  
Amounts reclassified from accumulated other comprehensive income 40 29  
Net current period change in other comprehensive income (5,618) 1,028  
Accumulated other comprehensive income balance, ending balance $ 262 $ 5,880