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INVENTORIES (Details) - USD ($)
$ in Thousands
Jun. 28, 2020
Dec. 29, 2019
Inventory Disclosure [Abstract]    
Raw materials and work-in-process $ 789,375 $ 800,749
Finished products 439,657 425,919
Operating supplies 45,440 82,447
Maintenance materials and parts 72,669 74,420
Total inventories $ 1,347,141 $ 1,383,535