DERIVATIVE FINANCIAL INSTRUMENTS (Schedule of Outstanding Derivative Instruments and Cash Collateral) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 27, 2020	Dec. 29, 2019
Fair values:
Cash collateral posted with brokers	$ 17,106	$ 20,009
Corn
Derivatives Coverage:
Derivatives coverage (as a percentage)	0.00%	12.00%
Soybean meal
Derivatives Coverage:
Derivatives coverage (as a percentage)	17.00%	44.00%
Commodity
Fair values:
Derivative assets, gross	$ 12,639	$ 5,053
Derivative liabilities, gross	(6,079)	(5,430)
Foreign currency
Fair values:
Derivative assets, gross	7,919	426
Derivative liabilities, gross	(316)	(5,400)
Interest rate swap instrument
Fair values:
Derivative liabilities, gross	$ (780)	$ 0