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Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Mar. 31, 2010 | Oct. 01, 2011 | Oct. 02, 2010 | Oct. 01, 2011 | Oct. 02, 2010 | Jun. 30, 2011 Seed [Member] | Oct. 01, 2011 Acquisitions 2011 [Member] | Oct. 01, 2011 Acquisitions 2011 [Member] | Oct. 01, 2011 RFPD and NuHorizons Combined [Member] | Oct. 01, 2011 RFPD and NuHorizons Combined [Member] | Mar. 01, 2011 RFPD [Member] | Jan. 03, 2011 Nu Horizons [Member] | Oct. 01, 2011 Nu Horizons [Member] | Oct. 02, 2010 Acquisitions 2010 [Member] | Oct. 02, 2010 Acquisitions 2010 [Member]
Business Acquisition, Purchase Price Allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,085 |  |  |
Business Acquisition, Purchase Price Allocation, Debt Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,375 |  |  |
Business Acquisition, Purchase Price Allocation, Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 162,880 |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 235,973 | 161,125 |  |  |
Sales |  | 5,186,857 |  | 4,657,841 |  | 15,949,791 |  | 13,506,514 |  |  |  |  | 231,738 | 661,134 |  |  |  |  |
Net income attributable to shareholders |  | 132,216 |  | 118,502 |  | 424,722 |  | 321,741 |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ 1.17 |  | $ 1.01 |  | $ 3.7 |  | $ 2.71 |  |  |  |  |  |  |  |  |  |  |
Diluted |  | $ 1.15 | [1] | $ 1 | [1] | $ 3.64 | [1] | $ 2.68 | [1] |  |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  |  |  | 5,200,002 | 16,114,096 |  |  |  |  |  | 5,077,977 | 15,025,717
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  |  |  |  |  | 132,128 | 428,486 |  |  |  |  |  | 126,422 | 346,620
Business Acquisition, Pro Forma Earnings Per Share, Basic |  |  |  |  |  |  |  |  |  |  | $ 1.17 | $ 3.74 |  |  |  |  |  | $ 1.08 | $ 2.92
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  |  |  |  |  |  |  |  |  |  | $ 1.15 | $ 3.68 |  |  |  |  |  | $ 1.07 | $ 2.88
Number of Sales Facilities |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |
Number of Value Added Engineers |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |
Number of Employees |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  | 400 | 700 |  |  |
Gain on bargain purchase |  | 0 |  | 0 |  | 1,755 |  | 0 |  |  |  |  |  |  |  | 1,755 |  |  |
Gain on bargain purchase, net of taxes |  |  |  |  |  | 1,078 |  | 0 |  |  |  |  |  |  |  | 1,078 |  |  |
Gain on Purchase of Business, Per Share Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |
Gain on Purchase of Business, Per Share Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |
Amortization of Intangible Assets |  | 9,268 |  | 5,342 |  | 25,431 |  | 14,636 |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period |  |  |  |  |  |  |  |  |  | 90,000 |  |  |  |  |  |  |  |  |
Payments to acquire additional interest in majority-owned subsidiary | $ 3,060 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | (a)Stock-based compensation awards for the issuance of 1,815 and 1,017 shares for the third quarter and first nine months of 2011 and 4,455 and 3,281 shares for the third quarter and first nine months of 2010, 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 The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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