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Cost in Excess of Net Assets of Companies Acquired - Intangibles (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 30, 2013 Customer Relationships [Member] | Dec. 31, 2012 Customer Relationships [Member] | Mar. 30, 2013 Developed Technology [Member] | Dec. 31, 2012 Developed Technology [Member] | Mar. 30, 2013 Other Intangible Assets [Member] | Dec. 31, 2012 Other Intangible Assets [Member] | Mar. 30, 2013 Trade Names [Member] | Dec. 31, 2012 Trade Names [Member] | Mar. 30, 2013 Minimum [Member] Other Intangible Assets [Member] | Mar. 30, 2013 Maximum [Member] Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Life |  |  |  | 11 years | 11 years | 5 years | 5 years |  |  |  |  |  |  |  |
Gross Carrying Amount | $ 515,704 |  | $ 518,424 | $ 323,722 | $ 325,509 | $ 10,416 | $ 11,154 | $ 2,566 | [1] | $ 2,761 | [1] | $ 179,000 | $ 179,000 |  |
Accumulated Amortization | (111,732) |  | (104,391) | (107,157) | (100,172) | (2,845) | (2,508) | (1,730) | [1] | (1,711) | [1] | 0 | 0 |  |
Net | 403,972 |  | 414,033 | 216,565 | 225,337 | 7,571 | 8,646 | 836 | [1] | 1,050 | [1] | 179,000 | 179,000 |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 3 years
Amortization of Intangible Assets | $ 8,957 | $ 9,671 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Consists of non-competition agreements and sales backlog with useful lives ranging from one to three years.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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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 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 2: 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 3: 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 Reference 4: 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=7658586&loc=d3e16323-109275 + Details
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