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Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | $ 36,523 |  |
Amortization of Intangible Assets | 11,500 | $ 6,800 |
Finite-Lived Intangible Assets, Gross | 376,957 |  | $ 372,670
Finite-Lived Intangible Assets, Accumulated Amortization | (218,451) |  | (207,334)
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 30,105 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 28,435 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 25,398 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 19,475 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 18,570 |  |
Finite-Lived Intangible Assets, Net | $ 158,506 |  |
Customer Lists [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years | 5 years 2 months |
Finite-Lived Intangible Assets, Gross | $ 333,922 |  | 330,496
Finite-Lived Intangible Assets, Accumulated Amortization | $ (180,081) |  | (171,005)
Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 1 month | 9 months |
Finite-Lived Intangible Assets, Gross | $ 20,138 |  | 19,689
Finite-Lived Intangible Assets, Accumulated Amortization | $ (19,913) |  | (18,081)
Developed Technology Rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years 1 month | 4 years 2 months |
Finite-Lived Intangible Assets, Gross | $ 22,897 |  | 22,485
Finite-Lived Intangible Assets, Accumulated Amortization | (18,457) |  | (18,248)
Tradenames And Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 629,007 |  | $ 615,090

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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=98514028&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=66006027&loc=d3e16323-109275 + Details
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