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Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 28, 2020 | Mar. 30, 2019 | Dec. 28, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | $ 787,621 |  | $ 779,822
Finite-Lived Intangible Assets, Accumulated Amortization | (350,795) |  | $ (333,507)
Amortization of Intangible Assets | 16,900 | $ 16,100 |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 66,969 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 62,588 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 57,618 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 51,337 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 37,710 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 160,604 |  |
Finite-Lived Intangible Assets, Net | $ 436,826 |  |
Customer Lists |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 9 years |  | 9 years 2 months 12 days
Finite-Lived Intangible Assets, Gross | $ 722,235 |  | $ 717,397
Finite-Lived Intangible Assets, Accumulated Amortization | $ (299,564) |  | $ (283,846)
Backlog |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 months 24 days |  | 1 year 3 months 18 days
Finite-Lived Intangible Assets, Gross | $ 30,236 |  | $ 29,426
Finite-Lived Intangible Assets, Accumulated Amortization | $ (28,724) |  | $ (28,283)
Developed Technology Rights |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years 8 months 12 days |  | 5 years 2 months 12 days
Finite-Lived Intangible Assets, Gross | $ 35,150 |  | $ 32,999
Finite-Lived Intangible Assets, Accumulated Amortization | (22,507) |  | (21,378)
Tradenames And Trademarks |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | $ 997,313 |  | $ 997,066

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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=118932676&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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