Derivatives (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Dec. 28, 2019
Derivative [Line Items]
Net income	$ 86,091,000	$ 19,640,000
Commodity Contract [Member]
Derivative [Line Items]
Forward purchase amount	36,200,000
Cash Flow Hedging [Member]
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within 12 months	6,600,000
Net income	0
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	(10,400,000)		$ 1,300,000
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Corn Option [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	$ 800,000		$ 400,000