Inventories (Details) - USD ($) $ in Thousands	Sep. 28, 2018	Dec. 29, 2017
Inventory, Net [Abstract]
Finished products and components	$ 145,077	$ 124,327
Products and components in various stages of completion	75,706	61,274
Raw materials and purchased components	113,349	103,407
Inventory gross	334,132	289,008
Reduction to LIFO cost	(56,406)	(49,659)
Total	$ 277,726	$ 239,349

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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