Annual report pursuant to Section 13 and 15(d)

Summary Of Significant Accounting Policies (Schedule Of Contract Liabilities From Contract With Customers) (Details)

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Summary Of Significant Accounting Policies (Schedule Of Contract Liabilities From Contract With Customers) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Summary Of Significant Accounting Policies [Abstract]    
Contract liabilities at beginning of period $ 15,055 $ 14,417
Increase due to deferral of revenue at period end 13,852 15,055
Decrease due to beginning contract liabilities recognized as revenue (15,055) (14,417)
Contract liabilities at end of period $ 13,852 $ 15,055