Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands	Jul. 13, 2019	Dec. 29, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Assets	$ 319	$ 501
Liabilities	(6,661)	(8,935)
Net Fair Value	(6,342)	(8,434)
Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	319	501
Liabilities	(6,661)	(8,935)
Net Fair Value	(6,342)	(8,434)
Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	179	501
Other Current Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	179	501
Other LongTerm Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	140
Other LongTerm Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	140
Other Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(5,819)	(7,732)
Other Current Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(5,819)	(7,732)
Other LongTerm Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(842)	(1,203)
Other LongTerm Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	$ (842)	$ (1,203)