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Nature of Operations and Summary of Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Accounting Policies [Abstract]    
Raw Materials and Supplies $ 43,739 $ 38,952
Work in Process 23,895 18,203
Finished Goods 24,102 27,778
Total Inventories $ 91,736 $ 84,933