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Nature of Operations and Summary of Significant Accounting Policies - Inventory (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Accounting Policies [Abstract]    
Customer deposits $ 24,012 $ 26,987
Raw Materials 49,332 44,522
Work in Process 15,344 15,876
Finished Goods (includes $559 and $494 at customer locations) 38,039 25,975
Inventories 102,715 86,373
Finished goods, at customer locations $ 559 $ 494