Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,951,446	$ 1,990,658	$ 2,048,247	$ 1,813,095	$ 1,924,104	$ 1,961,536	$ 1,976,299	$ 1,486,815	$ 7,803,446	$ 7,348,754	$ 5,787,980
Gross profit	541,603	556,422	574,812	481,355	512,797	516,890	514,056	377,066	2,154,192	1,920,809	1,490,058
Net earnings	$ 146,868	$ 151,266	$ 152,750	$ 81,081	$ 94,651	$ 119,068	$ 84,572	$ 50,495	$ 531,965	$ 348,786	$ 250,258
Basic earnings per share (usd per share)	$ 2.01	$ 2.08	$ 2.10	$ 1.11	$ 1.30	$ 1.64	$ 1.17	$ 0.73	$ 7.30	$ 4.86	$ 3.63
Diluted earnings per share (usd per share)	$ 2.00	$ 2.06	$ 2.08	$ 1.11	$ 1.29	$ 1.63	$ 1.16	$ 0.72	$ 7.25	$ 4.82	$ 3.61