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Acquisitions - Narrative (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 16, 2018 USD ($) | Jul. 02, 2018 USD ($) | Mar. 31, 2018 USD ($) business | Dec. 31, 2019 USD ($) business | Mar. 28, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 2,570,027 | $ 2,519,979
Distribution Companies in the Netherlands and Czech Republic |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase agreement price |  |  |  | 76,237 |
Goodwill |  |  |  | 38,366 |
Intangible assets subject to amortization |  |  |  | $ 12,789 |
Eliane |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase agreement price | $ 148,302 |  |  |  |
Goodwill | 33,019 |  |  |  |
Indebtedness acquired | 99,037 |  |  |  |
Intangible assets subject to amortization | 5,818 |  |  |  |
Godfrey Hirst Group |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase agreement price |  | $ 400,894 |  |  |
Goodwill |  | 88,655 |  |  |
Intangible assets subject to amortization |  | 43,635 |  |  |
Tradenames | Eliane |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived tradename intangible asset | $ 32,238 |  |  |  |
Tradenames | Godfrey Hirst Group |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived tradename intangible asset |  | $ 58,671 |  |  |
Flooring ROW segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | business |  |  | 3 | 2 |
Purchase agreement price |  |  | $ 24,610 |  |
Goodwill |  |  | 12,874 | $ 987,237 | $ 961,119
Intangible assets subject to amortization |  |  | $ 7 |  |

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