Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands		4 Months Ended
		Apr. 23, 2016	Apr. 25, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes		$ 92,378	$ 94,956
Tax benefit		(33,015)	(33,567)
Net income		59,363	61,389
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	[1]	(2,196)	(2,330)
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		(1,143)	(1,587)
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]	(1,859)	(2,581)
Tax benefit	[1]	716	994
Net income	[1]	(1,143)	(1,587)
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],[2]	(54)	144
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],[2]	(1,658)	(1,352)
Accumulated Defined Benefit Plans Adjustment
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(1,712)	(1,208)
Tax benefit	[1]	659	465
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	[1]	(1,053)	(743)
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]	(77)	(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],[3]	$ (1,782)	$ (2,504)

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

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

[3] 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.