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Inventories - Components of Inventory (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 53,549 $ 38,955
Work-in-process 10,185 9,036
Finished goods 45,955 46,741
Total inventories $ 109,689 $ 94,732