Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Sales	$ 8,593,096	$ 7,966,674	$ 7,216,081
Cost of goods sold, including warehouse and distribution expenses	4,084,085	3,804,031	3,507,180
Gross profit	4,509,011	4,162,643	3,708,901
Selling, general and administrative expenses	2,809,805	2,648,622	2,438,527
Operating income	1,699,206	1,514,021	1,270,374
Other income (expense):
Interest expense	(70,931)	(57,129)	(53,290)
Interest income	4,224	2,340	2,301
Other, net	4,692	1,134	2,797
Total other expense	(62,015)	(53,655)	(48,192)
Income before income taxes	1,637,191	1,460,366	1,222,182
Provision for income taxes	599,500	529,150	444,000
Net income	$ 1,037,691	$ 931,216	$ 778,182
Earnings per share-basic:
Earnings per share - basic	$ 10.87	$ 9.32	$ 7.46
Weighted-average common shares outstanding - basic	95,447	99,965	104,262
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 10.73	$ 9.17	$ 7.34
Weighted-average common shares outstanding - assuming dilution	96,720	101,514	106,041