Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Consolidated Statements of Income [Abstract]
Net sales	$ 730,433	$ 718,380	$ 1,468,637	$ 1,430,806
Cost of sales, including warehousing and distribution expenses	528,495	519,461	1,059,588	1,036,772
Gross profit on sales	201,938	198,919	409,049	394,034
Operating, general and administrative expenses	177,881	173,353	353,723	348,603
Income from operations	24,057	25,566	55,326	45,431
Investment income	682	585	1,319	1,117
Income before provision for income taxes	24,739	26,151	56,645	46,548
Provision for income taxes	9,474	9,507	21,252	16,581
Net income	$ 15,265	$ 16,644	$ 35,393	$ 29,967
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	$ 0.57	$ 0.62	$ 1.32	$ 1.12