Derivative Instruments Recorded on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	$ 291	$ 1,611
Derivative Liabilities	10,886	2,435
Commodity Contract | Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	259	1,576
Commodity Contract | Other LongTerm Assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	32	35
Commodity Contract | Other Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities	10,247	$ 2,435
Commodity Contract | Other LongTerm Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities	$ 639