Loss Reclassified From AOCI for Commodity Contracts (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 14, 2018	Jul. 15, 2017	Jul. 14, 2018	Jul. 15, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Net of tax		$ 126	$ 320	$ 423	$ 794
Gains/Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Gross loss reclassified from AOCI into income	[1]	168	520	565	1,291
Tax benefit	[1]	(42)	(200)	(142)	(497)
Net of tax	[1]	126	320	423	794
Commodity Contract | Gains/Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Gross loss reclassified from AOCI into income	[1],[2]	$ 135	$ 487	488	1,214
Tax benefit				(123)	(467)
Net of tax				$ 365	$ 747

[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.