Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Sales	$ 2,589,874	$ 2,456,073	$ 5,000,482	$ 4,738,754
Cost of goods sold, including warehouse and distribution expenses	1,221,587	1,167,435	2,352,905	2,248,858
Gross profit	1,368,287	1,288,638	2,647,577	2,489,896
Selling, general and administrative expenses	870,213	809,488	1,704,717	1,587,900
Operating income	498,074	479,150	942,860	901,996
Other income (expense):
Interest expense	(34,538)	(30,862)	(68,829)	(59,079)
Interest income	603	597	1,157	1,169
Other, net	832	988	3,935	1,193
Total other expense	(33,103)	(29,277)	(63,737)	(56,717)
Income before income taxes	464,971	449,873	879,123	845,279
Provision for income taxes	111,290	96,800	204,290	187,300
Net income	$ 353,681	$ 353,073	$ 674,833	$ 657,979
Earnings per share-basic:
Earnings per share - basic	$ 4.56	$ 4.32	$ 8.65	$ 7.96
Weighted-average common shares outstanding - basic	77,613	81,733	78,047	82,624
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 4.51	$ 4.28	$ 8.56	$ 7.89
Weighted-average common shares outstanding - assuming dilution	78,412	82,536	78,854	83,430