Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Consolidated Statements of Income [Abstract]
Net sales	$ 682,712	$ 661,610
Cost of sales, including warehousing and distribution expenses	491,585	478,485
Gross profit on sales	191,127	183,125
Operating, general, and administrative expenses	160,211	152,695
Income from operations	30,916	30,430
Investment income	977	1,057
Income before provision for income taxes	31,893	31,487
Provision for income taxes	11,764	11,461
Net income	$ 20,129	$ 20,026
Weighted-average shares outstanding, basic and diluted	26,898,443	26,898,443
Cash dividends per share	$ 0.3	$ 0.3
Basic and diluted earnings per share	$ 0.75	$ 0.74