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BUSINESS COMBINATIONS - Narrative (Details)
$ in Thousands, € in Millions, £ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2017
USD ($)
Mar. 24, 2017
USD ($)
Mar. 24, 2017
GBP (£)
Feb. 08, 2017
USD ($)
Feb. 08, 2017
CAD ($)
Nov. 03, 2016
USD ($)
Nov. 03, 2016
EUR (€)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Business Acquisition                    
Pro-forma adjustment to increase (decrease) transaction related costs               $ (22,100)   $ (26,800)
Severance and retention costs                   12,000
Angie's List                    
Business Acquisition                    
Voting interests acquired (as a percent) 100.00%                  
Consideration transferred $ 781,400                  
Cash acquisition price                 $ 10,757  
HomeStars                    
Business Acquisition                    
Voting interests acquired (as a percent)       90.00% 90.00%          
Cash acquisition price       $ 12,700 $ 16.6          
Ownership of noncontrolling interests (as a percent)       10.00% 10.00%          
Fair value at acquisition       $ 1,400 $ 1.9          
MyBuilder                    
Business Acquisition                    
Voting interests acquired (as a percent)   75.00% 75.00%              
Cash acquisition price   $ 40,700 £ 32.6              
Ownership of noncontrolling interests (as a percent)   25.00% 25.00%              
Fair value at acquisition   $ 13,300 £ 10.7              
MyHammer                    
Business Acquisition                    
Voting interests acquired (as a percent)           70.00% 70.00%   83.00%  
Consideration transferred           $ 19,700 € 17.7      
Ownership of noncontrolling interests (as a percent)           30.00% 30.00%      
Fair value at acquisition           $ 10,400 € 9.4      
Modification of Equity Awards                    
Business Acquisition                    
Pro-forma adjustment to increase (decrease) share-based compensation               (85,100)   (52,900)
Amortization Adjustment                    
Business Acquisition                    
Pro-forma adjustment to increase (decrease) amortization of intangibles               $ 11,300   $ 34,400