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Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 29, 2012 | Oct. 01, 2011 | Sep. 29, 2012 Acquisitions | Oct. 01, 2011 Acquisitions | Oct. 01, 2011 Acquisitions 2011 and 2012 [Member] | Oct. 01, 2011 Acquisitions 2011 and 2012 [Member] | Mar. 01, 2011 RFPD [Member] | Dec. 31, 2011 Nu Horizons [Member] | Oct. 01, 2011 Nu Horizons [Member] | Jan. 03, 2011 Nu Horizons [Member] | Sep. 29, 2012 Series of Individually Immaterial Business Acquisitions [Member] | Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions [Member] | Sep. 29, 2012 Individual Immaterial Business Acquisition [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Businesses Acquired |  |  |  |  | 7 |  | 6 |  |  |  |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  |  |  |  |  |  |  |  |  | $ 235,973 |  |  | $ 161,125 | $ 327,020 | $ 175,892 | $ 90,576
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,085 | 37,330 | 22,337 |
Business Acquisition, Purchase Price Allocation, Debt Paid |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,375 | 28,861 |  |
Business Acquisition, Contingent Consideration, at Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,390 |  |
Sales | 4,962,331 |  | 5,186,857 |  | 15,002,423 |  | 15,949,791 |  |  |  |  |  |  |  |  |  |
Net income attributable to shareholders | 103,617 |  | 132,216 |  | 331,628 |  | 424,722 |  |  |  |  |  |  |  |  |  |
Basic | $ 0.96 |  | $ 1.17 |  | $ 3.01 |  | $ 3.70 |  |  |  |  |  |  |  |  |  |
Diluted | $ 0.94 | [1] | $ 1.15 | [1] | $ 2.96 | [1] | $ 3.64 | [1] |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  | 5,334,078 | 16,533,556 |  |  |  |  |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  |  |  | 134,332 | 437,448 |  |  |  |  |  |  |
Business Acquisition, Pro Forma Earnings Per Share, Basic |  |  |  |  |  |  |  |  | $ 1.18 | $ 3.81 |  |  |  |  |  |  |
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | $ 1.17 | $ 3.75 |  |  |  |  |  |  |
Gain on bargain purchase | 0 |  | 0 |  | 0 |  | 1,755 |  |  |  |  | (667) | 1,755 |  |  |  |
Gain on bargain purchase, net of taxes |  |  |  |  |  |  |  |  |  |  |  | (410) | 1,078 |  |  |  |
Gain on Purchase of Business, Per Share Basic |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |
Gain on Purchase of Business, Per Share Diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |
Payments to acquire additional interest in majority-owned subsidiary |  |  |  |  | $ 2,526 |  |  |  |  |  |  |  |  |  |  |  |
[1] | (a)Stock-based compensation awards for the issuance of 1,789 and 1,403 shares for the third quarter and first nine months of 2012 and 1,815 and 1,017 shares for the third quarter and first nine months of 2011, 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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- Definition Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6910684&loc=d3e4570-128470 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 30 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=6910544&loc=d3e4243-128469 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 40 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6910732&loc=d3e4805-128471 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 29, 30, 41, 42, 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(3),(c)(1) -URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 25 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3642-128468 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 30 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6910544&loc=d3e4237-128469 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 65 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 25 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3629-128468 + Details
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