Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Assets	$ 1,611
Liabilities	(2,435)
Net Fair Value	(824)	$ (14,887)
Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	1,611
Liabilities	(2,435)
Net Fair Value	(824)	(11,946)
Level 2
Derivative Instruments, Gain (Loss) [Line Items]
Net Fair Value		(2,941)
Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	1,576
Other Current Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	1,576
Other LongTerm Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	35
Other LongTerm Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	35
Other Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(2,435)	(14,867)
Other Current Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	$ (2,435)	(11,926)
Other Current Liabilities | Level 2
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities		(2,941)
Other LongTerm Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities		(20)
Other LongTerm Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities		$ (20)