Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Consolidated Statements of Income
Sales	$ 1,714,969	$ 1,562,849	$ 3,299,978	$ 3,092,241
Cost of goods sold, including warehouse and distribution expenses	843,094	782,988	1,629,440	1,550,700
Gross profit	871,875	779,861	1,670,538	1,541,541
Selling, general and administrative expenses	575,614	536,258	1,123,193	1,050,437
Operating income	296,261	243,603	547,345	491,104
Other income (expense):
Interest expense	(11,467)	(9,140)	(22,867)	(18,271)
Interest income	469	658	946	1,285
Other, net	864	(51)	1,332	744
Total other expense	(10,134)	(8,533)	(20,589)	(16,242)
Income before income taxes	286,127	235,070	526,756	474,862
Provision for income taxes	109,000	88,950	195,300	181,250
Net income	$ 177,127	$ 146,120	$ 331,456	$ 293,612
Earnings per share-basic:
Earnings per share - basic	$ 1.61	$ 1.17	$ 2.99	$ 2.33
Weighted-average common shares outstanding - basic	110,278	124,870	110,914	125,920
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 1.58	$ 1.15	$ 2.94	$ 2.29
Weighted-average common shares outstanding - assuming dilution	112,079	127,188	112,736	128,261