Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Sales	$ 9,536,428	$ 8,977,726	$ 8,593,096
Cost of goods sold, including warehouse and distribution expenses	4,496,462	4,257,043	4,084,085
Gross profit	5,039,966	4,720,683	4,509,011
Selling, general and administrative expenses	3,224,782	2,995,283	2,809,805
Operating income	1,815,184	1,725,400	1,699,206
Other income (expense):
Interest expense	(122,129)	(91,349)	(70,931)
Interest income	2,521	2,347	4,224
Other, net	(1,489)	1,406	4,692
Total other expense	(121,097)	(87,596)	(62,015)
Income before income taxes	1,694,087	1,637,804	1,637,191
Provision for income taxes	369,600	504,000	599,500
Net income	$ 1,324,487	$ 1,133,804	$ 1,037,691
Earnings per share-basic:
Earnings per share - basic	$ 16.27	$ 12.82	$ 10.87
Weighted-average common shares outstanding - basic	81,406	88,426	95,447
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 16.10	$ 12.67	$ 10.73
Weighted-average common shares outstanding - assuming dilution	82,280	89,502	96,720