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Inventories - Components of Inventory (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 87,562 $ 55,913
Work-in-process 17,006 10,966
Finished goods 50,577 48,992
Total inventories $ 155,145 $ 115,871