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Acquisitions - Narrative (Details) $ in Thousands |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 02, 2018 USD ($) | Apr. 04, 2017 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) business | Jul. 01, 2017 USD ($) business | Apr. 01, 2017 USD ($) | Sep. 29, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 2,522,139 | $ 2,471,459
Godfrey Hirst Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase agreement price | $ 400,894 |  |  |  |  |  |  |
Goodwill | 88,636 |  |  |  |  |  |  |
Intangible assets subject to amortization | 43,635 |  |  |  |  |  |  |
Emilceramica S.r.l |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase agreement price |  | $ 186,099 |  |  |  |  |  |
Goodwill |  | 59,491 |  |  |  |  |  |
Intangible assets subject to amortization |  | 2,348 |  |  |  |  |  |
Tradenames | Godfrey Hirst Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Indefinite-lived tradename intangible asset | $ 58,671 |  |  |  |  |  |  |
Tradenames | Emilceramica S.r.l |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Indefinite-lived tradename intangible asset |  | $ 16,196 |  |  |  |  |  |
Flooring ROW segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase agreement price |  |  |  | $ 24,410 |  |  |  |
Goodwill |  |  |  | 12,548 |  |  | 970,145 | 908,807
Intangible assets subject to amortization |  |  |  | $ 7 |  |  |  |
Number of acquisitions | business |  |  |  | 3 |  |  |  |
Flooring ROW segment | Flooring ROW Acquisition |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase agreement price |  |  |  |  |  | $ 1,407 |  |
Intangible assets subject to amortization |  |  |  |  |  | $ 827 |  |
Global Ceramic segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 1,020,100 | 1,035,942
Global Ceramic segment | Global Ceramic Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase agreement price |  |  |  |  | $ 37,250 |  |  |
Goodwill |  |  |  |  | $ 1,002 |  |  |
Number of acquisitions | business |  |  |  |  | 2 |  |  |
Flooring NA segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 531,894 | $ 526,710
Flooring NA segment | Flooring NA Acquisition |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase agreement price |  |  |  |  | $ 26,623 |  |  |
Subsequent Event [Member] | Forecast | Eliane |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase agreement price |  |  | $ 250,000 |  |  |  |  |

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