Inventories (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 28, 2019
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 75,407	$ 85,769
Work-in-process	47,309	48,814
Finished goods	154,913	163,842
Valuation reserves	(7,510)	(6,318)
Inventories	$ 270,119	$ 292,107

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.

+ References

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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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