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Nature of Operations and Summary of Significant Accounting Policies - Inventory (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Accounting Policies [Abstract]    
Raw Materials $ 44,522 $ 38,952
Work in Process 15,876 18,203
Finished Goods (includes $494 and $1,883 at customer locations) 25,975 27,778
Inventories 86,373 84,933
Finished goods, at customer locations $ 494 $ 1,883