Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 1,014,287	$ 997,827	$ 2,000,967	$ 1,951,144
Cost of sales	512,695	495,740	1,007,915	965,007
Gross profit	501,592	502,087	993,052	986,137
Operating and administrative expenses	292,619	276,644	582,800	557,031
Gain on sale of property and equipment	(236)	(390)	(130)	(498)
Operating income	209,209	225,833	410,382	429,604
Interest income	92	63	153	162
Interest expense	(1,484)	(797)	(2,867)	(1,155)
Earnings before income taxes	207,817	225,099	407,668	428,611
Income tax expense	76,296	84,742	149,920	160,648
Net earnings	$ 131,521	$ 140,357	$ 257,748	$ 267,963
Basic net earnings per share (in dollars per share)	$ 0.46	$ 0.48	$ 0.89	$ 0.91
Diluted net earnings per share (in dollars per share)	$ 0.45	$ 0.48	$ 0.89	$ 0.91
Basic weighted average shares outstanding (in shares)	288,918,945	291,176,985	288,863,482	293,191,566
Diluted weighted average shares outstanding (in shares)	289,119,470	291,830,137	289,132,302	293,870,152