Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Consolidated Statements of Income [Abstract]
Net sales	$ 683,893	$ 661,412	$ 2,062,894	$ 2,006,196
Cost of sales, including warehousing and distribution expenses	498,216	478,649	1,502,776	1,441,984
Gross profit on sales	185,677	182,763	560,118	564,212
Operating, general and administrative expenses	165,733	164,919	498,433	477,835
Income from operations	19,944	17,844	61,685	86,377
Investment income	357	1,129	1,766	3,931
Income before provision for income taxes	20,301	18,973	63,451	90,308
Provision for income taxes	6,594	7,281	22,180	34,308
Net income	$ 13,707	$ 11,692	$ 41,271	$ 56,000
Weighted-average shares outstanding, basic and diluted	26,898,443	26,898,443	26,898,443	26,898,443
Cash dividends per share	$ 0.30	$ 0.30	$ 0.90	$ 0.90
Basic and diluted earnings per share	$ 0.51	$ 0.43	$ 1.53	$ 2.08