Loss Reclassified From AOCI for Commodity Contracts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Net of tax		$ 1,079	$ 1,367	$ 3,399
Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Gross loss reclassified from AOCI into income	[1]	1,443	2,222	5,528
Tax benefit	[1]	(364)	(855)	(2,129)
Net of tax	[1]	1,079	1,367	3,399
Commodity Contract | Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Gross loss reclassified from AOCI into income	[1],[2]	1,301	2,080	5,307
Tax benefit		(329)	(801)	(2,043)
Net of tax		$ 972	$ 1,279	$ 3,264

[1] Amounts in parentheses indicate debits to determine net income.

[2] Amounts are presented as an adjustment to reconcile net income to net cash provided by operating activities on the Consolidated Statements of Cash Flows.