Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				12 Months Ended		12 Months Ended	3 Months Ended
	Mar. 29, 2014		Mar. 30, 2013		Dec. 31, 2013 ComputerLinks [Member]	Oct. 28, 2013 ComputerLinks [Member]	Dec. 31, 2013 Series of Individually Immaterial Business Acquisitions [Member] Acquisitions	Mar. 29, 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	5,082,040		4,849,629
Business Acquisition, Pro Forma Revenue			5,102,603
Net income attributable to shareholders	107,120		77,875
Business Acquisition, Pro Forma Net Income (Loss)			$ 80,667
Basic	$ 1.07		$ 0.74
Business Acquisition, Pro Forma Earnings Per Share, Basic			$ 0.76
Diluted	$ 1.06	[1]	$ 0.72	[1]
Business Acquisition, Pro Forma Earnings Per Share, Diluted			$ 0.75

[1] Stock-based compensation awards for the issuance of 492 and 1,360 shares for the first quarters of 2014 and 2013, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.