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Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands	Jul. 11, 2020	Dec. 28, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Assets	$ 27	$ 3,780
Liabilities	(5,487)	(1,606)
Net Fair Value	(5,460)	2,174
Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	27	3,780
Liabilities	(5,487)	(1,606)
Net Fair Value	(5,460)	2,174
Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	21	3,191
Other Current Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	21	3,191
Other LongTerm Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	6	589
Other LongTerm Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	6	589
Other Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(4,497)	(814)
Other Current Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(4,497)	(814)
Other LongTerm Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(990)	(792)
Other LongTerm Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	$ (990)	$ (792)

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