Derivative Financial Instruments (Accumulated Other Comprehensive Income (Loss) Related To Derivative Transactions) (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 08, 2011	Oct. 09, 2010	Oct. 08, 2011	Oct. 09, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions	$ (8,078,000)	$ (17,871,000)	$ (17,078,000)	$ 15,898,000
Closed Or Expiring Over The Next Three Years [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			16,000,000
Closed Or Expiring Over The Next Three Years [Member] | Closed Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI			500,000
Closed Or Expiring Over The Next Three Years [Member] | Closed Contracts [Member] | Commodity Price [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI			600,000
Closed Or Expiring Over The Next Three Years [Member] | Closed Contracts [Member] | Interest Rate Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI			(100,000)
Closed Or Expiring Over The Next Three Years [Member] | Expiring In 2011 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			800,000
Closed Or Expiring Over The Next Three Years [Member] | Expiring In 2011 [Member] | Commodity Price [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			300,000
Closed Or Expiring Over The Next Three Years [Member] | Expiring In 2011 [Member] | Interest Rate Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			500,000
Closed Or Expiring Over The Next Three Years [Member] | Expiring In 2012 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			14,100,000
Closed Or Expiring Over The Next Three Years [Member] | Expiring In 2012 [Member] | Commodity Price [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			12,500,000
Closed Or Expiring Over The Next Three Years [Member] | Expiring In 2012 [Member] | Interest Rate Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			1,600,000
Closed Or Expiring Over The Next Three Years [Member] | Expiring In 2013 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			600,000
Closed Or Expiring Over The Next Three Years [Member] | Expiring In 2013 [Member] | Commodity Price [Member]
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 Three Years [Member] | Expiring In 2013 [Member] | Interest Rate Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			500,000
Closed Or Expiring Over The Next Three Years [Member] | Commodity Price [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			13,500,000
Closed Or Expiring Over The Next Three Years [Member] | Interest Rate Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions			$ 2,500,000