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INVENTORIES
 12 Months Ended
Dec. 27, 2020
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES
    Inventories consisted of the following:
December 27, 2020December 29, 2019
 (In thousands)
Raw materials and work-in-process$868,369 $800,749 
Finished products 356,052 425,919 
Operating supplies66,495 82,447 
Maintenance materials and parts67,877 74,420 
Total inventories$1,358,793 $1,383,535