Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Consolidated Statements of Income [Abstract]
Net sales	$ 691,875	$ 662,072	$ 1,379,002	$ 1,344,784
Cost of sales, including warehousing and distribution expenses	504,151	471,750	1,004,560	963,335
Gross profit on sales	187,724	190,322	374,442	381,449
Operating, general and administrative expenses	168,286	152,705	332,701	312,917
Income from operations	19,438	37,617	41,741	68,532
Investment income	656	1,824	1,409	2,802
Income before provision for income taxes	20,094	39,441	43,150	71,334
Provision for income taxes	7,296	15,262	15,586	27,027
Net income	$ 12,798	$ 24,179	$ 27,564	$ 44,307
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	$ 0.60	$ 0.60
Basic and diluted earnings per share	$ 0.48	$ 0.90	$ 1.02	$ 1.65