Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 14, 2018	Jul. 15, 2017	Jul. 14, 2018	Jul. 15, 2017
Income Statement [Abstract]
Sales	$ 941,283	$ 926,639	$ 2,147,736	$ 2,114,288
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)	488,871	468,246	1,113,993	1,076,314
Selling, distribution and administrative expenses	360,365	355,542	814,828	818,608
Depreciation and amortization	35,098	34,128	79,287	81,316
Loss on inferior ingredients	3,884		3,884
Impairment of assets			2,483
Multi-employer pension plan withdrawal costs			2,322
Restructuring charges	801		2,060
Gain on divestiture				(28,875)
Income from operations	52,264	68,723	128,879	166,925
Interest expense	8,214	8,436	19,210	20,061
Interest income	(6,466)	(5,158)	(14,561)	(11,735)
Pension plan settlement loss	1,035		5,703
Other components of net periodic pension and postretirement benefits credit	(298)	(1,443)	(1,033)	(3,366)
Income before income taxes	49,779	66,888	119,560	161,965
Income tax expense	4,337	22,148	22,871	56,807
Net income	$ 45,442	$ 44,740	$ 96,689	$ 105,158
Basic:
Net income per common share	$ 0.22	$ 0.21	$ 0.46	$ 0.50
Weighted average shares outstanding	211,048	209,483	210,956	209,277
Diluted:
Net income per common share	$ 0.21	$ 0.21	$ 0.46	$ 0.50
Weighted average shares outstanding	211,507	210,269	211,443	210,223
Cash dividends paid per common share	$ 0.1800	$ 0.1700	$ 0.3500	$ 0.3300