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Fair Value of Assets and Liabilities - Impairment of Assets (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 26, 2020 | Dec. 28, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Goodwill | $ 799,791 | $ 820,589
Fair Value, Nonrecurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Impairment Charge | 33,841 |
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Goodwill | 8,953 |
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Goodwill | $ 9,449 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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