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Accumulated Other Comprehensive Income (Loss) Related to Derivative Transactions (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jul. 13, 2013	Jul. 14, 2012	Jul. 13, 2013	Jul. 14, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions	$ (6,918,000)	$ 9,958,000	$ (15,539,000)	$ 2,949,000
Closed Or Expiring Over The Next Four Years
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			11,500,000
Closed Or Expiring Over The Next Four Years | Closed Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI			3,500,000
Closed Or Expiring Over The Next Four Years | Expiring in 2013
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			5,800,000
Closed Or Expiring Over The Next Four Years | Expiring in 2014
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			2,000,000
Closed Or Expiring Over The Next Four Years | Expiring in 2015
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			100,000
Closed Or Expiring Over The Next Four Years | Expiring in 2016
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			100,000
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			10,200,000
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years | Closed Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI			2,200,000
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years | Expiring in 2013
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			5,800,000
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years | Expiring in 2014
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			2,000,000
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years | Expiring in 2015
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			100,000
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years | Expiring in 2016
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			100,000
Interest rate risk derivatives | Closed Or Expiring Over The Next Four Years
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			1,300,000
Interest rate risk derivatives | Closed Or Expiring Over The Next Four Years | Closed Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI			$ 1,300,000

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- Definition

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

No definition available.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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