Inventories (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 122,931	$ 85,927
Work-in-process	73,336	49,361
Finished goods	197,006	186,785
Valuation reserves	(8,291)	(7,071)
Inventories	$ 384,982	$ 315,002

Amount of inventory reserves for last-in first-out (LIFO) and other inventory valuation methods.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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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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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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