FAIR VALUE MEASUREMENTS (Schedule of Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 25, 2016	Dec. 27, 2015
Commodity Futures Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 5,341	$ 59
Derivative liabilities	(4,063)	(5,436)
Commodity Options Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	98	1,618
Derivative liabilities	(2,764)
Level 1 [Member] | Commodity Futures Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	5,341	59
Derivative liabilities	(4,063)	(5,436)
Level 1 [Member] | Commodity Options Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	98	1,618
Derivative liabilities	(2,764)
Level 2 [Member] | Commodity Futures Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Level 2 [Member] | Commodity Options Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0
Level 3 [Member] | Commodity Futures Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Level 3 [Member] | Commodity Options Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	$ 0
Derivative liabilities	$ 0