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Inventories (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Inventory Disclosure [Abstract]    
Raw materials and work-in-process $ 255,863 $ 259,658
Finished goods 74,468 75,112
Inventory reserves (12,329) (11,224)
Total Inventory, Net $ 318,002 $ 323,546