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INVENTORIES
 3 Months Ended
Mar. 28, 2021
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES
Inventories consisted of the following:
March 28, 2021December 27, 2020
 (In thousands)
Raw materials and work-in-process$966,319 $868,369 
Finished products343,772 356,052 
Operating supplies61,560 66,495 
Maintenance materials and parts68,264 67,877 
Total inventories$1,439,915 $1,358,793