Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended				12 Months Ended		12 Months Ended	6 Months Ended
	Jun. 28, 2014		Jun. 29, 2013		Jun. 28, 2014		Jun. 29, 2013		Dec. 31, 2013 ComputerLinks [Member]	Oct. 28, 2013 ComputerLinks [Member]	Dec. 31, 2013 Series of Individually Immaterial Business Acquisitions [Member] Acquisitions	Jun. 28, 2014 2014 Acquisition [Member] Acquisitions
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross									$ 313,209
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	1
Payments to Acquire Businesses, Net of Cash Acquired					60,224		9,382				80,210	66,287
Sales	5,676,539		5,306,085		10,758,579		10,155,714
Business Acquisition, Pro Forma Revenue			5,563,757				10,666,360
Net income attributable to shareholders	127,884		89,935		235,004		167,810
Business Acquisition, Pro Forma Net Income (Loss)			$ 93,878				$ 174,545
Basic	$ 1.29		$ 0.87		$ 2.36		$ 1.61
Business Acquisition, Pro Forma Earnings Per Share, Basic			$ 0.91				$ 1.67
Diluted	$ 1.27	[1]	$ 0.86	[1]	$ 2.33	[1]	$ 1.58	[1]
Business Acquisition, Pro Forma Earnings Per Share, Diluted			$ 0.90				$ 1.65

[1] Stock-based compensation awards for the issuance of 316 and 241 shares for the second quarter and first six months of 2014 and 1,296 and 1,171 for the second quarter and first six months of 2013, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.