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INVENTORIES
 12 Months Ended
Dec. 26, 2021
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES
    Inventories consisted of the following:
December 26, 2021December 27, 2020
 (In thousands)
Raw materials and work-in-process$1,044,739 $868,369 
Finished products 379,705 356,052 
Operating supplies76,590 66,495 
Maintenance materials and parts74,624 67,877 
Total inventories$1,575,658 $1,358,793