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INVENTORIES (Tables)
6 Months Ended
Jun. 27, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories consisted of the following:
June 27, 2021December 27, 2020
 (In thousands)
Raw materials and work-in-process$1,044,299 $868,369 
Finished products354,015 356,052 
Operating supplies62,640 66,495 
Maintenance materials and parts69,060 67,877 
Total inventories$1,530,014 $1,358,793