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INVENTORIES
 9 Months Ended
Sep. 26, 2021
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES
Inventories consisted of the following:
September 26, 2021December 27, 2020
 (In thousands)
Raw materials and work-in-process$1,040,242 $868,369 
Finished products382,799 356,052 
Operating supplies62,830 66,495 
Maintenance materials and parts70,950 67,877 
Total inventories$1,556,821 $1,358,793