DERIVATIVE FINANCIAL INSTRUMENTS (Schedule of Outstanding Derivative Instruments and Cash Collateral) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 28, 2020	Dec. 29, 2019
Fair values:
Cash collateral posted with brokers	$ 27,031	$ 20,009
Corn
Derivatives Coverage:
Derivatives coverage (as a percentage)	7.00%	12.00%
Soybean meal
Derivatives Coverage:
Derivatives coverage (as a percentage)	16.00%	44.00%
Commodity
Fair values:
Derivative assets, gross	$ 11,481	$ 5,053
Derivative liabilities, gross	(25,324)	(5,430)
Foreign currency
Fair values:
Derivative assets, gross	13,911	426
Derivative liabilities, gross	(504)	(5,400)
Interest rate swap instrument
Fair values:
Derivative liabilities, gross	$ (931)	$ 0