Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Income
Sales	$ 1,601,558	$ 1,535,453	$ 4,693,799	$ 4,397,509
Cost of goods sold, including warehouse and distribution expenses	796,065	781,243	2,346,765	2,254,857
Gross profit	805,493	754,210	2,347,034	2,142,652
Selling, general and administrative expenses	542,175	513,160	1,592,612	1,482,797
Operating income	263,318	241,050	754,422	659,855
Other income (expense):
Interest expense	(10,451)	(7,212)	(28,722)	(18,706)
Interest income	565	516	1,850	1,620
Write-off of asset-based revolving credit facility debt issuance costs	0	0	0	(21,626)	[1]
Termination of interest rate swap agreements	0	0	0	(4,237)
Other, net	550	675	1,294	1,279
Total other expense	(9,336)	(6,021)	(25,578)	(41,670)
Income before income taxes	253,982	235,029	728,844	618,185
Provision for income taxes	94,650	86,590	275,900	233,500
Net income	$ 159,332	$ 148,439	$ 452,944	$ 384,685
Earnings per share-basic:
Earnings per share - basic	$ 1.34	$ 1.12	$ 3.67	$ 2.81
Weighted-average common shares outstanding - basic	118,546	132,777	123,448	136,895
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 1.32	$ 1.10	$ 3.60	$ 2.76
Weighted-average common shares outstanding - assuming dilution	120,539	135,033	125,670	139,183

[1] Certain prior period amounts have been reclassified to conform to current period presentation.