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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