Financial Instruments - Summary of Location and Fair Value (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Derivatives, Fair Value [Line Items]
Total derivative assets	$ 1,155	$ 1,423
Total derivative liabilities	(88)	(109)
Other Current Assets [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Other current assets: Gain positions	1,155	1,435
Other current assets: Loss positions	0	(12)
Other Current Liabilities [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Other current liability: Gain positions	15	50
Other current liability: Loss positions	$ (103)	$ (159)