Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands	Apr. 18, 2020	Dec. 28, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Assets	$ 2,646	$ 3,780
Liabilities	(4,856)	(1,606)
Net Fair Value	(2,210)	2,174
Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	2,646	3,780
Liabilities	(4,856)	(1,606)
Net Fair Value	(2,210)	2,174
Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	1,942	3,191
Other Current Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	1,942	3,191
Other LongTerm Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	704	589
Other LongTerm Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	704	589
Other Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(3,634)	(814)
Other Current Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(3,634)	(814)
Other LongTerm Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(1,222)	(792)
Other LongTerm Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	$ (1,222)	$ (792)