Loss Reclassified From AOCI for Commodity Contracts (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 06, 2018	Oct. 07, 2017	Oct. 06, 2018	Oct. 07, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Net of tax		$ 266	$ 372	$ 689	$ 1,166
Gains/Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Gross loss reclassified from AOCI into income	[1]	356	604	921	1,895
Tax benefit	[1]	(90)	(232)	(232)	(729)
Net of tax	[1]	266	372	689	1,166
Commodity Contract | Gains/Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Gross loss reclassified from AOCI into income	[1],[2]	$ 323	$ 571	811	1,785
Tax benefit				(205)	(687)
Net of tax				$ 606	$ 1,098

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

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