Inventories (Details) - USD ($) $ in Thousands	Sep. 27, 2019	Dec. 28, 2018
Inventory, Net [Abstract]
Finished products and components	$ 142,184	$ 142,535
Products and components in various stages of completion	88,345	83,768
Raw materials and purchased components	119,242	115,705
Inventory gross	349,771	342,008
Reduction to LIFO cost	(61,183)	(58,026)
Total	$ 288,588	$ 283,982

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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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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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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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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