DERIVATIVE FINANCIAL INSTRUMENTS (Schedule of Outstanding Derivative Instruments and Cash Collateral) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 26, 2017	Dec. 25, 2016
Fair values:
Cash collateral posted with brokers	$ 4,415	$ 4,979
Corn
Derivatives Coverage:
Derivatives coverage (as a percentage)	0.30%	2.30%
Period through which stated percent of needs are covered:
Maturity date	Sep. 30, 2018	Sep. 30, 2018
Soybean meal
Derivatives Coverage:
Derivatives coverage (as a percentage)	0.90%	0.30%
Period through which stated percent of needs are covered:
Maturity date	Dec. 31, 2017	Jul. 31, 2017
Commodity
Fair values:
Derivative assets, gross	$ 3,978	$ 5,439
Derivative liabilities, gross	(4,234)	(6,827)
Foreign currency
Fair values:
Derivative liabilities, gross	$ (605)	$ 0