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Cost in Excess of Net Assets of Companies Acquired - Intangibles (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 02, 2016 | Mar. 28, 2015 | Dec. 31, 2015
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 622,143 |  |  | $ 613,390 |
Accumulated Amortization | (238,640) |  |  | (224,064) |
Net | 383,503 |  |  | $ 389,326 |
Amortization of Intangible Assets | 12,913 |  | $ 11,107 |  |
Amortization of intangible assets, net of tax | $ 10,634 |  | $ 9,029 |  |
Amortization of intangible assets, per share basic | $ 0.12 |  | $ 0.09 |  |
Amortization of intangible assets, per share diluted | $ 0.11 |  | $ 0.09 |  |
Customer Relationships [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Life | 10 years |  |  | 10 years |
Gross Carrying Amount | $ 501,895 |  |  | $ 498,319 |
Accumulated Amortization | (227,733) |  |  | (215,263) |
Net | $ 274,162 |  |  | $ 283,056 |
Developed Technology [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Life | 5 years |  |  | 5 years |
Gross Carrying Amount | $ 13,625 |  |  | $ 13,154 |
Accumulated Amortization | (8,975) |  |  | (7,894) |
Net | 4,650 |  |  | 5,260 |
Other Intangible Assets [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 5,623 | [1] |  | 917 | [2]
Accumulated Amortization | (1,932) | [1] |  | (907) | [2]
Net | 3,691 | [1] |  | 10 | [2]
Trade Names [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 101,000 |  |  | 101,000 |
Accumulated Amortization | 0 |  |  | 0 |
Net | $ 101,000 |  |  | $ 101,000 |
Minimum [Member] | Other Intangible Assets [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life | 2 years |  |  |  |
Maximum [Member] | Other Intangible Assets [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life | 3 years |  |  |  |
[1] | Consists of non-competition agreements and sales backlog with useful lives ranging from two to three years.
[2] | Consists of non-competition agreements with useful lives ranging from two 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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- 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 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=56944662&loc=d3e3602-108585 Reference 3: 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=26713463&loc=d3e16323-109275 + Details
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