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Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | $ 64,293 |  | $ 64,293 |  |
Amortization of Intangible Assets | 14,700 | $ 9,800 | 30,800 | $ 21,300 |
Finite-Lived Intangible Assets, Gross | 762,055 |  | 762,055 |  | $ 710,834
Finite-Lived Intangible Assets, Accumulated Amortization | (299,857) |  | (299,857) |  | (268,414)
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 61,657 |  | 61,657 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 58,333 |  | 58,333 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 52,828 |  | 52,828 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 45,602 |  | 45,602 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 179,485 |  | 179,485 |  |
Finite-Lived Intangible Assets, Net | 462,198 |  | $ 462,198 |  |
Customer Lists |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 9 years 6 months | 9 years 6 months |
Finite-Lived Intangible Assets, Gross | 705,379 |  | $ 705,379 |  | 644,145
Finite-Lived Intangible Assets, Accumulated Amortization | (252,831) |  | $ (252,831) |  | (222,661)
Backlog |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 2 years | 2 years 9 months 18 days |
Finite-Lived Intangible Assets, Gross | 27,797 |  | $ 27,797 |  | 27,065
Finite-Lived Intangible Assets, Accumulated Amortization | (26,447) |  | $ (26,447) |  | (24,755)
Developed Technology Rights |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 4 years 9 months 18 days | 5 years 10 months 24 days |
Finite-Lived Intangible Assets, Gross | 28,879 |  | $ 28,879 |  | 39,624
Finite-Lived Intangible Assets, Accumulated Amortization | (20,579) |  | (20,579) |  | (20,998)
Tradenames And Trademarks |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | $ 980,557 |  | $ 980,557 |  | $ 918,604

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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