Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	4 Months Ended
	Apr. 21, 2018	Apr. 22, 2017
Income Statement [Abstract]
Sales	$ 1,206,453	$ 1,187,649
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)	625,122	608,068
Selling, distribution and administrative expenses	454,463	463,066
Depreciation and amortization	44,189	47,188
Impairment of assets	2,483
Multi-employer pension plan withdrawal costs	2,322
Restructuring charges	1,259
Gain on divestiture		(28,875)
Income from operations	76,615	98,202
Interest expense	10,996	11,625
Interest income	(8,095)	(6,577)
Pension plan settlement loss	4,668
Other components of net periodic pension and postretirement benefits credit	(735)	(1,923)
Income before income taxes	69,781	95,077
Income tax expense	18,534	34,659
Net income	$ 51,247	$ 60,418
Basic:
Net income per common share	$ 0.24	$ 0.29
Weighted average shares outstanding	210,888	209,123
Diluted:
Net income per common share	$ 0.24	$ 0.29
Weighted average shares outstanding	211,311	210,275
Cash dividends paid per common share	$ 0.1700	$ 0.1600