INVENTORIES - Schedule of Inventory (Details) - USD ($) $ in Thousands	Jun. 27, 2021	Dec. 31, 2020
Inventory [Line Items]
Raw materials	$ 218,116	$ 157,219
Work in process	26,466	19,282
Finished goods	57,827	37,632
Total manufactured goods, net	292,094	205,813
Materials purchased for resale (distribution products)	119,765	112,158
Total materials purchased for resale (distribution products), net	114,141	106,996
Total inventories	406,235	312,809
Manufactured Goods
Inventory [Line Items]
Less: reserve for inventory obsolescence	(10,315)	(8,320)
Distributed Goods
Inventory [Line Items]
Less: reserve for inventory obsolescence	$ (5,624)	$ (5,162)

Inventory, Manufactured Goods, Net

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Carrying amount, net of valuation reserves and allowances, as of the balance sheet date of inventories purchased for resale.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 of valuation reserve for inventory.

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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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Gross amount of components used by the entity which are bought from another entity rather than produced by the entity.

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