Quarterly Financial Data Quarterly Financial Information Table (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016		Oct. 01, 2016		Jul. 02, 2016		Apr. 02, 2016		Dec. 31, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Quarterly Financial Data [Abstract]
Sales	$ 6,442,891		$ 5,936,092		$ 5,972,101		$ 5,474,177		$ 6,751,342	$ 5,698,304	$ 5,829,989	$ 5,002,385	$ 23,825,261		$ 23,282,020		$ 22,768,674
Gross Profit	823,348		773,162		798,791		748,898		838,966	742,367	768,595	685,322
Net income attributable to shareholders	$ 164,518		$ 117,727		$ 134,270		$ 106,235		$ 158,492	$ 109,244	$ 123,932	$ 106,058	$ 522,750		$ 497,726		$ 498,045
Basic	$ 1.84	[1]	$ 1.29	[1]	$ 1.46	[1]	$ 1.16	[1]	$ 1.71	$ 1.16	$ 1.30	$ 1.11	$ 5.75		$ 5.26		$ 5.05
Diluted	$ 1.81	[1]	$ 1.28	[1]	$ 1.45	[1]	$ 1.14	[1]	$ 1.69	$ 1.15	$ 1.28	$ 1.09	$ 5.68	[2]	$ 5.20	[2]	$ 4.98	[2]

[1] Quarterly net income per share is calculated using the weighted-average shares outstanding during each quarterly period, while net income per share for the full year is calculated using the weighted-average shares outstanding during the year. Therefore, the sum of the net income per share for each of the four quarters may not equal the net income per share for the full year.

[2] Stock-based compensation awards for the issuance of 766 shares, 658 shares, and 294 shares for the years ended December 31, 2016, 2015, and 2014, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.