Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Consolidated Statements of Income [Abstract]
Net sales	$ 2,876,748	$ 2,776,683	$ 2,692,588
Cost of sales, including warehousing and distribution expenses	2,090,016	2,023,721	1,947,120
Gross profit on sales	786,732	752,962	745,468
Operating, general and administrative expenses	695,953	671,587	631,796
Income from operations	90,779	81,375	113,672
Investment income	1,552	2,287	4,684
Income before provision for income taxes	92,331	83,662	118,356
Provision for income taxes	33,001	29,281	45,170
Net income	$ 59,330	$ 54,381	$ 73,186
Weighted-average shares outstanding, basic and diluted	26,898,443	26,898,443	26,898,443
Cash dividends per share	$ 1.20	$ 1.20	$ 1.20
Basic and diluted earnings per share	$ 2.21	$ 2.02	$ 2.72