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Cost in Excess of Net Assets of Companies Acquired - Intangibles (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  | 9 Months Ended
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Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013 | Dec. 31, 2013 | Sep. 27, 2014 Customer Relationships [Member] | Dec. 31, 2013 Customer Relationships [Member] | Sep. 27, 2014 Developed Technology [Member] | Dec. 31, 2013 Developed Technology [Member] | Sep. 27, 2014 Other Intangible Assets [Member] | Dec. 31, 2013 Other Intangible Assets [Member] | Sep. 27, 2014 Trade Names [Member] | Dec. 31, 2013 Trade Names [Member] | Sep. 27, 2014 Minimum [Member] Other Intangible Assets [Member] | Sep. 27, 2014 Maximum [Member] Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Life |  |  |  |  |  | 10 years | 10 years | 5 years | 5 years |  |  |  |  |  |  |  |
Gross Carrying Amount | $ 591,623 |  | $ 591,623 |  | $ 567,478 | $ 400,554 | $ 374,244 | $ 9,366 | $ 9,625 | $ 2,703 | [1] | $ 4,609 | [1] | $ 179,000 | $ 179,000 |  |
Accumulated Amortization | (169,913) |  | (169,913) |  | (141,409) | (162,517) | (134,817) | (5,339) | (4,051) | (2,057) | [1] | (2,541) | [1] | 0 | 0 |  |
Net | 421,710 |  | 421,710 |  | 426,069 | 238,037 | 239,427 | 4,027 | 5,574 | 646 | [1] | 2,068 | [1] | 179,000 | 179,000 |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 3 years
Amortization of Intangible Assets | 11,108 | 8,936 | 32,925 | 26,762 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets, net of tax | $ 9,086 | $ 7,074 | $ 26,860 | $ 21,219 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets, per share basic | $ 0.09 | $ 0.07 | $ 0.27 | $ 0.21 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets, per share diluted | $ 0.09 | $ 0.07 | $ 0.27 | $ 0.20 |  |  |  |  |  |  |  |  |  |  |  |  |
[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=26713463&loc=d3e16265-109275 + Details
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