Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Income Statement [Abstract]
Net sales	$ 1,047,349	$ 1,098,704	$ 2,053,689	$ 2,084,524
Cost of sales, including advertising, warehousing and distribution expenses	766,157	805,816	1,505,108	1,527,489
Gross profit on sales	281,192	292,888	548,581	557,035
Operating, general and administrative expenses	235,633	236,886	471,189	463,605
Income from operations	45,559	56,002	77,392	93,430
Investment income (loss) and interest expense	2,140	3,066	3,752	(953)
Other income (expense)	(1,831)	(2,618)	(2,606)	58
Income before provision for income taxes	45,868	56,450	78,538	92,535
Provision for income taxes	12,396	14,978	20,811	24,374
Net income	$ 33,472	$ 41,472	$ 57,727	$ 68,161
Weighted-average shares outstanding, basic	26,898,443	26,898,443	26,898,443	26,898,443
Weighted-average shares outstanding, diluted	26,898,443	26,898,443	26,898,443	26,898,443
Cash dividends per share	$ 0.31	$ 0.31	$ 0.62	$ 0.62
Basic earnings per share	1.24	1.54	2.15	2.53
Diluted earnings per share	$ 1.24	$ 1.54	$ 2.15	$ 2.53