Accumulated Other Comprehensive Income (Loss) Related to Derivative Transactions (Detail) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions	$ (1,546,000)	$ (17,851,000)	$ 27,700,000
Closed Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI	1,100,000
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	4,100,000
Closed or Expiring Over Next Three Years | Expiring in 2013 and Beyond
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions	3,000,000
Commodity Option | Closed Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI	100,000
Commodity Option | 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	2,500,000
Commodity Option | Closed or Expiring Over Next Three Years | Expiring in 2013 and Beyond
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions	2,400,000
Interest rate swap derivatives | Closed Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated amount of derivatives to be reclassified in income from AOCI	1,000,000
Interest rate swap 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	1,600,000
Interest rate swap derivatives | Closed or Expiring Over Next Three Years | Expiring in 2013 and Beyond
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions	$ 600,000