Inventories, Net (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 31,555	$ 32,377
Work-in-process	12,835	18,642
Finished goods	64,196	64,978
Supplies and other	201	260
LIFO reserve	(18,828)	(20,748)
Inventories, net	$ 89,959	$ 95,509

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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 by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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

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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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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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