Consolidated Statements Of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Net sales	$ 3,869,187	$ 3,733,507	$ 3,326,106
Cost of sales	1,920,253	1,836,105	1,606,661
Gross profit	1,948,934	1,897,402	1,719,445
Operating and administrative expenses	1,121,590	1,110,776	1,007,431
Gain on sale of property and equipment	(1,411)	(964)	(643)
Operating income	828,755	787,590	712,657
Interest income	373	759	924
Interest expense	(3,108)	(915)	(113)
Earnings before income taxes	826,020	787,434	713,468
Income tax expense	309,659	293,284	264,832
Net earnings	$ 516,361	$ 494,150	$ 448,636
Basic net earnings per share (in dollars per share)	$ 1.77	$ 1.67	$ 1.51
Diluted net earnings per share (in dollars per share)	$ 1.77	$ 1.66	$ 1.51
Basic weighted average shares outstanding (in shares)	291,453,107	296,490,378	296,754,160
Diluted weighted average shares outstanding (in shares)	292,045,442	297,313,244	297,683,588