Financial Instruments - Summary of Location and Fair Value (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 30, 2017
Derivatives, Fair Value [Line Items]
Total derivative assets	$ 80	$ 1,009
Total derivative liabilities	(951)	(3,155)
Other Current Assets [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Other current assets: Gain positions	207	1,014
Other current assets: Loss positions	(127)	(5)
Other Current Liabilities [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Other current liability: Gain positions	880	55
Other current liability: Loss positions	$ (1,831)	$ (3,210)