FAIR VALUE MEASUREMENTS (Schedule of Carrying Amounts and Estimated Fair Values of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 27, 2015	Dec. 28, 2014
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	5.75%
Carrying Amount [Member] \| Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-rate senior notes payable at 5.75%	$ (500,000)	$ 0
Fair Value [Member] \| Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-rate senior notes payable at 5.75%	(488,750)	0
Commodity Futures Instruments [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	59	8,416
Derivative liabilities	(5,436)	(8,580)
Commodity Futures Instruments [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	59	8,416
Derivative liabilities	(5,436)	(8,580)
Commodity Options Instruments [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1,618	0
Derivative liabilities	0	(14,103)
Commodity Options Instruments [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1,618	0
Derivative liabilities	0	(14,103)
Foreign Currency Futures Instruments [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	2,563
Foreign Currency Futures Instruments [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	$ 0	$ 2,563

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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