Accumulated Other Comprehensive Loss (Income) Related to Derivative Transactions (Detail) (USD $)	3 Months Ended				9 Months Ended
	Oct. 04, 2014		Oct. 05, 2013		Oct. 04, 2014		Oct. 05, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions	$ (9,092,000)	[1]	$ (1,585,000)	[1]	$ (9,908,000)	[1]	$ (17,124,000)	[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					19,100,000
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					2,500,000
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					(300,000)
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					16,100,000
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					800,000
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					17,900,000
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					1,300,000
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					(300,000)
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					16,100,000
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					800,000
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.