Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 10, 2015	Oct. 04, 2014	Oct. 10, 2015	Oct. 04, 2014
Income Statement [Abstract]
Sales	$ 885,302	$ 844,932	$ 2,920,142	$ 2,871,640
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)	464,045	442,978	1,507,214	1,496,874
Selling, distribution and administrative expenses	322,087	302,086	1,064,619	1,037,628
Impairment of assets			2,275	4,489
Depreciation and amortization	29,419	29,487	99,704	98,686
Income from operations	69,751	70,381	246,330	233,963
Interest expense	5,992	6,285	20,349	21,902
Interest income	(5,114)	(4,875)	(17,029)	(15,586)
Income before income taxes	68,873	68,971	243,010	227,647
Income tax expense	25,077	24,372	86,065	79,918
Net income	$ 43,796	$ 44,599	$ 156,945	$ 147,729
Basic:
Net income per common share	$ 0.21	$ 0.21	$ 0.75	$ 0.70
Weighted average shares outstanding	210,842	210,084	210,318	209,573
Diluted:
Net income per common share	$ 0.21	$ 0.21	$ 0.74	$ 0.69
Weighted average shares outstanding	213,310	213,154	212,921	213,005
Cash dividends paid per common share	$ 0.1450	$ 0.1200	$ 0.4225	$ 0.3525