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Nature of Operations and Summary of Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Accounting Policies [Abstract]    
Raw Materials $ 49,174 $ 49,332
Work in Process 15,765 15,344
Finished Goods 44,724 38,039
Total Inventories $ 109,663 $ 102,715