Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Sales	$ 10,149,985	$ 9,536,428	$ 8,977,726
Cost of goods sold, including warehouse and distribution expenses	4,755,294	4,496,462	4,257,043
Gross profit	5,394,691	5,039,966	4,720,683
Selling, general and administrative expenses	3,473,965	3,224,782	2,995,283
Operating income	1,920,726	1,815,184	1,725,400
Other income (expense):
Interest expense	(139,975)	(122,129)	(91,349)
Interest income	2,545	2,521	2,347
Other, net	7,033	(1,489)	1,406
Total other expense	(130,397)	(121,097)	(87,596)
Income before income taxes	1,790,329	1,694,087	1,637,804
Provision for income taxes	399,287	369,600	504,000
Net income	$ 1,391,042	$ 1,324,487	$ 1,133,804
Earnings per share-basic:
Earnings per share	$ 18.07	$ 16.27	$ 12.82
Weighted-average common shares outstanding - basic	76,985	81,406	88,426
Earnings per share-assuming dilution:
Earnings per share	$ 17.88	$ 16.10	$ 12.67
Weighted-average common shares outstanding - assuming dilution	77,788	82,280	89,502