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Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying amount | $ 779,822 | $ 710,834 |
Finite-Lived Intangible Assets, Accumulated Amortization | (333,507) | (268,414) |
Indefinite-Lived Intangible Assets, Fair Value |  |  | $ 93,000
Indefinite-Lived Intangible Assets, Carrying Value |  |  | 151,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0 | 0 | 58,000
Finite-Lived Intangible Assets, Amortization Expense | $ 64,000 | $ 60,000 | $ 38,600
Customer Lists |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Weighted Avg Remaining LIfe | 9 years 2 months 12 days | 9 years 6 months |
Gross Carrying amount | $ 717,397 | $ 644,145 |
Finite-Lived Intangible Assets, Accumulated Amortization | $ (283,846) | $ (222,661) |
Service Backlog |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Weighted Avg Remaining LIfe | 1 year 3 months 18 days | 2 years 9 months 18 days |
Gross Carrying amount | $ 29,426 | $ 27,065 |
Finite-Lived Intangible Assets, Accumulated Amortization | $ (28,283) | $ (24,755) |
Developed Technology Rights |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Weighted Avg Remaining LIfe | 5 years 2 months 12 days | 5 years 10 months 24 days |
Gross Carrying amount | $ 32,999 | $ 39,624 |
Finite-Lived Intangible Assets, Accumulated Amortization | (21,378) | (20,998) |
Tradenames And Trademarks |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 997,066 | $ 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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