Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands	Oct. 08, 2016	Jan. 02, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Assets	$ 1,380
Liabilities	(8,659)	$ (14,887)
Net Fair Value	(7,279)	(14,887)
Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	1,380
Liabilities	(8,457)	(11,946)
Net Fair Value	(7,077)	(11,946)
Level 2
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(202)	(2,941)
Net Fair Value	(202)	(2,941)
Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	1,219
Other Current Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	1,219
Other LongTerm Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	161
Other LongTerm Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	161
Other Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(8,614)	(14,867)
Other Current Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(8,412)	(11,926)
Other Current Liabilities | Level 2
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(202)	(2,941)
Other LongTerm Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(45)	(20)
Other LongTerm Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	$ (45)	$ (20)