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Inventories (Disclosure of inventory, current) (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Inventory Disclosure [Abstract]    
Raw materials and work-in-process $ 238,198 $ 259,658
Finished goods 82,940 75,112
Inventory reserves (10,794) (11,224)
Total Inventory, Net $ 310,344 $ 323,546