Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Jan. 02, 2016	Oct. 10, 2015	Jul. 18, 2015	Jan. 03, 2015	Oct. 04, 2014	Jul. 12, 2014	Apr. 25, 2015	Apr. 19, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Income Statement [Abstract]
Sales	$ 858,363	$ 885,302	$ 888,795	$ 877,333	$ 844,932	$ 872,791	$ 1,146,045	$ 1,153,917	$ 3,778,505	$ 3,748,973	$ 3,732,616
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)	455,939	464,045	457,253	453,759	442,978	458,019	585,916	595,877	1,963,153	1,950,633	1,972,221
Selling, distribution and administrative expenses					302,086	314,995		420,547	1,381,527	1,368,289	1,356,742
Depreciation and amortization									132,175	128,961	118,491
Pension plan settlement loss										15,387
Impairment of assets									3,771	10,308
Gain on acquisition											(50,071)
Income from operations									297,879	275,395	335,233
Interest expense									26,815	28,288	28,875
Interest income									(21,967)	(20,947)	(16,015)
Income before income taxes									293,031	268,054	322,373
Income tax expense									103,840	92,315	91,479
Net income	$ 32,246	$ 43,796	$ 51,760	$ 28,010	$ 44,599	$ 42,064	$ 61,389	$ 61,066	$ 189,191	$ 175,739	$ 230,894
Basic:
Net income per common share									$ 0.90	$ 0.84	$ 1.11
Weighted average shares outstanding									210,793	209,683	207,935
Diluted:
Net income per common share									$ 0.89	$ 0.82	$ 1.09
Weighted average shares outstanding									213,356	213,092	211,927
Cash dividends paid per common share									$ 0.5675	$ 0.4850	$ 0.4440