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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
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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.

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