Summary of Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands		4 Months Ended
		Apr. 22, 2017	Apr. 23, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes		$ 95,077	$ 92,378
Tax benefit		(34,659)	(33,015)
Net income		60,418	59,363
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	[1]	(1,617)	(2,196)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	[2]	474	1,143
Gains/Losses on Cash Flow Hedges
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax		(474)	(1,143)
Gains/Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	[1]	(771)	(1,859)
Tax benefit	[1]	297	716
Net income	[1]	(474)	(1,143)
Amortization of defined benefit pension items, prior service (cost) credits
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1],[3]	(54)	(54)
Amortization of defined benefit pension items, actuarial losses
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1],[3]	(1,805)	(1,658)
Accumulated Defined Benefit Plans Adjustment
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Tax benefit	[1]	716	659
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(1,859)	(1,712)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	[1]	(1,143)	(1,053)
Interest Rate Contracts | Gains/Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	[1]	(44)	(77)
Commodity Contract | Gains/Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	[1],[4]	$ (727)	$ (1,782)

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

[2] Amounts in parentheses, if any, indicate credits to determine net income.

[3] These items are included in the computation of net periodic pension cost. See Note 14, Post-retirement Plans, for additional information.

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