Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Consolidated Statements of Income [Abstract]
Net sales	$ 3,509,270	$ 3,466,807	$ 3,136,720
Cost of sales, including advertising, warehousing and distribution expenses	2,574,269	2,554,284	2,273,182
Gross profit on sales	935,001	912,523	863,538
Operating, general and administrative expenses	851,411	836,098	765,213
Income from operations	83,590	76,425	98,325
Investment income (loss) and interest expense	(1,454)	2,598	2,457
Gain on bargain purchase	0	0	23,879
Income before provision for income taxes	82,136	79,023	124,661
Provision for income taxes	19,398	(19,391)	37,499
Net income	$ 62,738	$ 98,414	$ 87,162
Weighted-average shares outstanding, basic and diluted	26,898,443	26,898,443	26,898,443
Cash dividends per share	$ 1.21	$ 1.20	$ 1.20
Basic and diluted earnings per share	$ 2.33	$ 3.66	$ 3.24