Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Income
Sales	$ 1,562,849	$ 1,479,318	$ 3,092,241	$ 2,862,056
Cost of goods sold, including warehouse and distribution expenses	782,988	760,657	1,550,700	1,473,614
Gross profit	779,861	718,661	1,541,541	1,388,442
Selling, general and administrative expenses	536,258	496,293	1,050,437	969,637
Operating income	243,603	222,368	491,104	418,805
Other income (expense):
Interest expense	(9,140)	(6,257)	(18,271)	(11,494)
Interest income	658	562	1,285	1,104
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	(51)	309	744	604
Total other expense	(8,533)	(5,386)	(16,242)	(35,649)
Income before income taxes	235,070	216,982	474,862	383,156
Provision for income taxes	88,950	83,210	181,250	146,910
Net income	$ 146,120	$ 133,772	$ 293,612	$ 236,246
Earnings per share-basic:
Earnings per share - basic	$ 1.17	$ 0.97	$ 2.33	$ 1.70
Weighted-average common shares outstanding - basic	124,870	137,399	125,920	138,982
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 1.15	$ 0.96	$ 2.29	$ 1.67
Weighted-average common shares outstanding - assuming dilution	127,188	139,716	128,261	141,289

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