Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Sales	$ 2,666,528	$ 2,482,717	$ 7,667,010	$ 7,221,471
Cost of goods sold, including warehouse and distribution expenses	1,243,998	1,166,962	3,596,903	3,415,820
Gross profit	1,422,530	1,315,755	4,070,107	3,805,651
Selling, general and administrative expenses	886,167	830,607	2,590,884	2,418,507
Operating income	536,363	485,148	1,479,223	1,387,144
Other income (expense):
Interest expense	(35,858)	(31,582)	(104,687)	(90,661)
Interest income	656	669	1,813	1,838
Other, net	732	1,416	4,667	2,609
Total other expense	(34,470)	(29,497)	(98,207)	(86,214)
Income before income taxes	501,893	455,651	1,381,016	1,300,930
Provision for income taxes	110,600	89,500	314,890	276,800
Net income	$ 391,293	$ 366,151	$ 1,066,126	$ 1,024,130
Earnings per share-basic:
Earnings per share - basic	$ 5.14	$ 4.54	$ 13.77	$ 12.50
Weighted-average common shares outstanding - basic	76,172	80,593	77,415	81,939
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 5.08	$ 4.50	$ 13.63	$ 12.36
Weighted-average common shares outstanding - assuming dilution	76,969	81,410	78,220	82,841