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Cost in Excess of Net Assets of Companies Acquired - Intangibles (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 27, 2015 | Jun. 28, 2014 | Jun. 27, 2015 | Jun. 28, 2014 | Dec. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  | $ 624,665 |  | $ 624,665 |  | $ 513,561
Accumulated Amortization |  | (199,895) |  | (199,895) |  | (177,850)
Net |  | 424,770 |  | 424,770 |  | $ 335,711
Amortization of Intangible Assets |  | 13,917 | $ 10,870 | 25,024 | $ 21,817 |
Amortization of intangible assets, net of tax |  | $ 11,169 | $ 8,867 | $ 20,198 | $ 17,774 |
Amortization of intangible assets, per share basic |  | $ 0.12 | $ 0.09 | $ 0.21 | $ 0.18 |
Amortization of intangible assets, per share diluted |  | $ 0.12 | $ 0.09 | $ 0.21 | $ 0.18 |
Customer Relationships [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-Average Life |  | 10 years |  |  |  | 10 years
Gross Carrying Amount |  | $ 509,735 |  | $ 509,735 |  | $ 402,036
Accumulated Amortization |  | (192,664) |  | (192,664) |  | (171,071)
Net |  | $ 317,071 |  | 317,071 |  | $ 230,965
Developed Technology [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-Average Life |  | 5 years |  |  |  | 5 years
Gross Carrying Amount |  | $ 12,994 |  | 12,994 |  | $ 8,806
Accumulated Amortization |  | (6,458) |  | (6,458) |  | (5,444)
Net |  | 6,536 |  | 6,536 |  | 3,362
Other Intangible Assets [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount | [1] | 936 |  | 936 |  | 1,719
Accumulated Amortization | [1] | (773) |  | (773) |  | (1,335)
Net | [1] | 163 |  | 163 |  | 384
Trade Names [Member] |  |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  | 101,000 |  | 101,000 |  | 101,000
Accumulated Amortization |  | 0 |  | 0 |  | 0
Net |  | $ 101,000 |  | $ 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 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=31042434&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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