Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Sales	$ 2,035,518	$ 1,847,088	$ 3,937,421	$ 3,575,031
Cost of goods sold, including warehouse and distribution expenses	976,727	896,211	1,891,671	1,746,438
Gross profit	1,058,791	950,877	2,045,750	1,828,593
Selling, general and administrative expenses	673,023	614,403	1,309,609	1,204,999
Operating income	385,768	336,474	736,141	623,594
Other income (expense):
Interest expense	(14,319)	(12,819)	(28,721)	(26,228)
Interest income	577	506	1,157	1,137
Other, net	182	637	1,295	1,255
Total other expense	(13,560)	(11,676)	(26,269)	(23,836)
Income before income taxes	372,208	324,798	709,872	599,758
Provision for income taxes	138,700	119,151	263,500	220,251
Net income	$ 233,508	$ 205,647	$ 446,372	$ 379,507
Earnings per share-basic:
Earnings per share - basic	$ 2.32	$ 1.94	$ 4.42	$ 3.58
Weighted-average common shares outstanding - basic	100,547	105,772	101,078	105,982
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 2.29	$ 1.91	$ 4.35	$ 3.52
Weighted-average common shares outstanding - assuming dilution	102,109	107,556	102,684	107,817