Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 1,013,122	$ 995,250	$ 3,014,089	$ 2,946,394
Cost of sales	513,288	493,025	1,521,203	1,458,032
Gross profit	499,834	502,225	1,492,886	1,488,362
Operating and administrative expenses	297,047	282,378	879,847	839,409
Gain on sale of property and equipment	(182)	(162)	(312)	(659)
Operating income	202,969	220,009	613,351	649,612
Interest income	105	137	258	299
Interest expense	(1,835)	(942)	(4,702)	(2,096)
Earnings before income taxes	201,239	219,204	608,907	647,815
Income tax expense	74,314	82,710	224,234	243,358
Net earnings	$ 126,925	$ 136,494	$ 384,673	$ 404,457
Basic net earnings per share (in dollars per share)	$ 0.44	$ 0.47	$ 1.33	$ 1.38
Diluted net earnings per share (in dollars per share)	$ 0.44	$ 0.47	$ 1.33	$ 1.38
Basic weighted average shares outstanding (in shares)	288,995,492	289,917,768	288,907,934	292,083,511
Diluted weighted average shares outstanding (in shares)	289,149,606	290,474,539	289,135,842	292,720,637