Accumulated Other Comprehensive Loss (Income) Related to Derivative Transactions (Detail) (USD $)	3 Months Ended				6 Months Ended
	Jul. 12, 2014		Jul. 13, 2013		Jul. 12, 2014		Jul. 13, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions	$ (16,166,000)	[1]	$ (6,918,000)	[1]	$ (816,000)	[1]	$ (15,539,000)	[1]
Closed or Expiring Over Next Three Years
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions					8,800,000
Closed or Expiring Over Next Three Years | Closed Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI					(200,000)
Closed or Expiring Over Next Three 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					3,100,000
Closed or Expiring Over Next Three 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					5,800,000
Closed or Expiring Over Next Three 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 Next Three Years
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions					7,600,000
Commodity price risk derivatives | Closed or Expiring Over Next Three Years | Closed Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI					(1,400,000)
Commodity price risk derivatives | Closed or Expiring Over Next Three 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					3,100,000
Commodity price risk derivatives | Closed or Expiring Over Next Three 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					5,800,000
Commodity price risk derivatives | Closed or Expiring Over Next Three 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
Interest rate risk derivatives | Closed or Expiring Over Next Three Years
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions					1,200,000
Interest rate risk derivatives | Closed or Expiring Over Next Three Years | Closed Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI					$ 1,200,000

[1] Amounts in parentheses indicate debits to determine net income.