Quarterly Financial Data Quarterly Financial Information Table (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 26, 2015		Jun. 27, 2015		Mar. 28, 2015		Dec. 31, 2014		Sep. 27, 2014		Jun. 28, 2014		Mar. 29, 2014		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Quarterly Financial Data [Abstract]
Gain on sale of investment							$ 1,667
Gain on sale of investment, Net of Tax, Per Basic and Diluted Share							$ 0
Sales	$ 6,751,342		$ 5,698,304		$ 5,829,989		$ 5,002,385		$ 6,396,879		$ 5,613,216		$ 5,676,539		$ 5,082,040		$ 23,282,020		$ 22,768,674		$ 21,357,285
Gross Profit	838,966		742,367		768,595		685,322		815,859		728,687		747,521		703,828
Net income attributable to shareholders	$ 158,492	[1]	$ 109,244	[2]	$ 123,932	[3]	$ 106,058	[4]	$ 116,177	[5]	$ 146,864	[6]	$ 127,884	[7]	$ 107,120	[8]	$ 497,726		$ 498,045		$ 399,420
Basic	$ 1.71	[1],[9]	$ 1.16	[2],[9]	$ 1.30	[3],[9]	$ 1.11	[4],[9]	$ 1.20	[5]	$ 1.49	[6]	$ 1.29	[7]	$ 1.07	[8]	$ 5.26		$ 5.05		$ 3.89
Diluted	$ 1.69	[1],[9]	$ 1.15	[2],[9]	$ 1.28	[3],[9]	$ 1.09	[4],[9]	$ 1.18	[5]	$ 1.47	[6]	$ 1.27	[7]	$ 1.06	[8]	$ 5.20	[10]	$ 4.98	[10]	$ 3.85	[10]

[1] restructuring, integration, and other charges ($13,198 net of related taxes or $.14 per share on both a basic and diluted basis)

[2] restructuring, integration, and other charges ($12,642 net of related taxes or $.13 per share on both a basic and diluted basis)

[3] restructuring, integration, and other charges ($12,895 net of related taxes or $.13 per share on both a basic and diluted basis). Also included is a loss on investment ($921 net of related taxes or $.01 per share on both a basic and diluted basis).

[4] Includes identifiable intangible asset amortization ($9,029 net of related taxes or $.09 per share on both a basic and diluted basis) and restructuring, integration, and other charges ($12,569 net of related taxes or $.13 per share on both a basic and diluted basis)

[5] restructuring, integration, and other charges ($11,222 net of related taxes or $.12 and $.11 per share on a basic and diluted basis, respectively), and a non-cash impairment charge associated with discontinuing the use of a trade name ($47,911 net of related taxes or $.49 per share on both a basic and diluted basis).

[6] ($9,086 net of related taxes or $.09 per share on both a basic and diluted basis) and restructuring, integration, and other charges ($2,556 net of related taxes or $.03 per share on both a basic and diluted basis). Also included is a gain on sale of investment ($18,269 net of related taxes or $.19 and $.18 per share on a basic and diluted basis, respectively).

[7] ($8,867 net of related taxes or $.09 per share on both a basic and diluted basis) and restructuring, integration, and other charges ($7,526 net of related taxes or $.08 and $.07 per share on a basic and diluted basis, respectively).

[8] restructuring, integration, and other charges ($8,020 net of related taxes or $.08 per share on both a basic and diluted basis)

[9] 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.

[10] Stock-based compensation awards for the issuance of 658 shares, 294 shares, and 874 shares for the years ended December 31, 2015, 2014, and 2013, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.