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Nature of Operations and Summary of Significant Accounting Policies - Inventory (Details) - USD ($)
$ in Thousands
Jan. 02, 2021
Dec. 28, 2019
Accounting Policies [Abstract]    
Raw Materials $ 46,413 $ 49,332
Work in Process 17,692 15,344
Finished Goods (includes $427 and $559 at customer locations) 42,709 38,039
Inventories 106,814 102,715
Finished goods, at customer locations $ 427 $ 559