Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 06, 2018	Oct. 07, 2017	Oct. 06, 2018	Oct. 07, 2017
Income Statement [Abstract]
Sales	$ 923,449	$ 932,822	$ 3,071,185	$ 3,047,110
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)	485,680	476,264	1,599,673	1,552,578
Selling, distribution and administrative expenses	353,051	356,826	1,167,879	1,175,434
Depreciation and amortization	32,662	32,972	111,949	114,288
Loss (recovery) on inferior ingredients	(1,891)		1,993
Impairment of assets			2,483
Multi-employer pension plan withdrawal costs		18,268	2,322	18,268
Restructuring and related impairment charges	497	100,549	2,557	100,549
Gain on divestiture				(28,875)
Income (loss) from operations	53,450	(52,057)	182,329	114,868
Interest expense	8,180	8,194	27,390	28,255
Interest income	(6,615)	(5,464)	(21,176)	(17,199)
Pension plan settlement loss	930	3,030	6,633	3,030
Other components of net periodic pension and postretirement benefits credit	(171)	(1,321)	(1,204)	(4,687)
Income (loss) before income taxes	51,126	(56,496)	170,686	105,469
Income tax expense (benefit)	11,496	(22,925)	34,367	33,882
Net income (loss)	$ 39,630	$ (33,571)	$ 136,319	$ 71,587
Basic:
Net income (loss) per common share	$ 0.19	$ (0.16)	$ 0.65	$ 0.34
Weighted average shares outstanding	211,082	209,606	210,994	209,376
Diluted:
Net income (loss) per common share	$ 0.19	$ (0.16)	$ 0.64	$ 0.34
Weighted average shares outstanding	211,564	209,606	211,452	210,231
Cash dividends paid per common share	$ 0.1800	$ 0.1700	$ 0.5300	$ 0.5000