Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Consolidated Statements of Income [Abstract]
Net sales	$ 1,006,340	$ 985,820
Cost of sales, including advertising, warehousing and distribution expenses	738,950	721,673
Gross profit on sales	267,390	264,147
Operating, general and administrative expenses	235,556	226,719
Income from operations	31,834	37,428
Investment income (loss) and interest expense	1,611	(4,019)
Other income (expense)	(775)	2,676
Income before provision for income taxes	32,670	36,085
Provision for income taxes	8,415	9,396
Net income	$ 24,255	$ 26,689
Weighted-average shares outstanding, basic and diluted	26,898,443	26,898,443
Cash dividends per share	$ 0.31	$ 0.31
Basic and diluted earnings per share	$ 0.90	$ 0.99