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General (Details 2) - USD ($)
$ in Thousands
Mar. 28, 2019
Dec. 27, 2018
Summary of Significant Accounting Policies [Line Items]    
Unrecognized loss on interest rate swap agreements $ (525) $ (149)
Net unrecognized actuarial loss for pension obligation (6,530) (6,609)
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (7,055) $ (6,758)