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Nature of Operations and Summary of Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Accounting Policies [Abstract]    
Raw Materials $ 47,918 $ 49,332
Work in Process 17,089 15,344
Finished Goods 43,708 38,039
Total Inventories $ 108,715 $ 102,715