Consolidated Statements of Earnings (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net sales	$ 847,596	$ 804,890	$ 1,653,922	$ 1,573,765
Cost of sales	404,875	389,739	789,321	764,437
Gross profit	442,721	415,151	864,601	809,328
Operating and administrative expenses	250,750	236,538	498,084	469,508
Gain on sale of property and equipment	(243)	(282)	(456)	(108)
Operating income	192,214	178,895	366,973	339,928
Interest income	168	144	615	240
Interest expense	(3)	0	(37)	0
Earnings before income taxes	192,379	179,039	367,551	340,168
Income tax expense	71,370	66,733	137,494	127,668
Net earnings	$ 121,009	$ 112,306	$ 230,057	$ 212,500
Basic net earnings per share	$ 0.41	$ 0.38	$ 0.78	$ 0.72
Diluted net earnings per share	$ 0.41	$ 0.38	$ 0.77	$ 0.72
Basic weighted average shares outstanding	296,778,588	296,110,167	296,711,326	295,826,501
Diluted weighted average shares outstanding	297,722,270	297,129,898	297,689,550	297,021,238