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Revenue And Contract Liabilities (Schedule Of Contract Liabilities From Contract With Customers) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 29, 2019
Dec. 29, 2018
Revenue And Contract Liabilities [Abstract]    
Contract liabilities at beginning of period $ 15,055 $ 14,417
Increase due to deferral of revenue at period end 13,798 15,055
Decrease due to beginning contract liabilities recognized as revenue (14,546) (14,417)
Contract liabilities at end of period $ 14,307 $ 15,055