Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands	Jan. 02, 2016	Jan. 03, 2015
Derivatives, Fair Value [Line Items]
Liabilities	$ 14,887
Net Fair Value	14,887	$ 16,253
Level 1
Derivatives, Fair Value [Line Items]
Liabilities	11,946
Net Fair Value	11,946	12,930
Level 2
Derivatives, Fair Value [Line Items]
Liabilities	2,941
Net Fair Value	2,941	3,323
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	14,867	12,898
Other Current Liabilities | Level 1
Derivatives, Fair Value [Line Items]
Liabilities	11,926	10,873
Other Current Liabilities | Level 2
Derivatives, Fair Value [Line Items]
Liabilities	2,941	2,025
Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	20	3,355
Other LongTerm Liabilities | Level 1
Derivatives, Fair Value [Line Items]
Liabilities	$ 20	2,057
Other LongTerm Liabilities | Level 2
Derivatives, Fair Value [Line Items]
Liabilities		$ 1,298