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Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands	Jul. 14, 2018	Dec. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Assets		$ 291
Liabilities	$ (7,865)	(10,886)
Net Fair Value	(7,865)	(10,595)
Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets		291
Liabilities	(7,865)	(10,886)
Net Fair Value	(7,865)	(10,595)
Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets		259
Other Current Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets		259
Other LongTerm Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets		32
Liabilities		(639)
Other LongTerm Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets		32
Liabilities		(639)
Other Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(4,741)	(10,247)
Other Current Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(4,741)	$ (10,247)
Other LongTerm Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(3,124)
Other LongTerm Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	$ (3,124)

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