INVENTORIES (Details) - USD ($) $ in Thousands	Mar. 27, 2022	Dec. 26, 2021
Reclassification [Line Items]
Raw materials and work-in-process	$ 1,124,232	$ 1,034,518
Finished products	410,784	369,292
Operating supplies	87,822	87,332
Maintenance materials and parts	86,157	84,516
Total inventories	$ 1,708,995	1,575,658
Changes to Previously Reported
Reclassification [Line Items]
Raw materials and work-in-process		(10,200)
Finished products		(10,400)
Operating supplies		10,700
Maintenance materials and parts		$ 9,900

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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