Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended		12 Months Ended	9 Months Ended	1 Months Ended
	Sep. 27, 2014		Sep. 28, 2013		Sep. 27, 2014		Sep. 28, 2013		Dec. 31, 2013 ComputerLinks [Member]	Oct. 28, 2013 ComputerLinks [Member]	Dec. 31, 2013 Series of Individually Immaterial Business Acquisitions [Member] Acquisitions	Sep. 27, 2014 2014 Acquisitions [Member] Acquisitions	Oct. 29, 2014 2014 Acquisitions [Member] Acquisitions
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross									$ 313,209				$ 37,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents										20,981
Business Combination, Contingent Consideration, Liability											4,498	5,853
Business Combination, Other Amounts Withheld												210
Number of Businesses Acquired											4	3	2
Payments to Acquire Businesses, Net of Cash Acquired					129,522		43,392				80,210	135,585
Sales	5,613,216		5,048,211		16,371,795		15,203,925
Business Acquisition, Pro Forma Revenue			5,273,114				15,939,474
Net income attributable to shareholders	146,864		96,779		381,868		264,589
Business Acquisition, Pro Forma Net Income (Loss)			$ 98,105				$ 272,572
Basic	$ 1.49		$ 0.96		$ 3.84		$ 2.56
Business Acquisition, Pro Forma Earnings Per Share, Basic			$ 0.97				$ 2.64
Diluted	$ 1.47	[1]	$ 0.95	[1]	$ 3.80	[1]	$ 2.53	[1]
Business Acquisition, Pro Forma Earnings Per Share, Diluted			$ 0.96				$ 2.61

[1] Stock-based compensation awards for the issuance of 317 and 271 shares for the third quarter and first nine months of 2014 and 831 and 871 for the third quarter and first nine months of 2013, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.