Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Mar. 27, 2020	Dec. 27, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 94,811	$ 85,329
Work in process	42,188	31,825
Finished goods	14,244	17,700
Excess and obsolete adjustment	(7,522)	(7,817)
Total inventories, net	$ 143,721	$ 127,037

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.

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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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