Gain or Loss Reclassified from Accumulated Other Comprehensive Income for Commodity Contracts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gross (gain) loss reclassified from AOCI into Income	$ 17,272	$ (38,038)	$ 8,475
Tax (benefit) expense	(7,734)	13,123	(5,051)
Net of tax	12,354	(20,962)	8,069
Commodity Contract
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax (benefit) expense	(6,650)	14,645	(3,263)
Commodity Contract | Production Costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax	$ 10,622	$ (23,393)	$ 5,212