v3.20.2
ACQUISITIONS - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 27, 2020
USD ($)
acquisition
Sep. 29, 2019
USD ($)
Sep. 27, 2020
USD ($)
acquisition
Sep. 29, 2019
USD ($)
acquisition
Dec. 31, 2019
USD ($)
acquisition
Business Acquisition [Line Items]          
Number of acquisitions | acquisition 6   9 2 4
Excluding assessed tax $ 700,707 $ 566,186 $ 1,713,984 $ 1,787,622  
Operating Income (Loss) 59,829 37,410 111,214 118,465  
Fair value of estimated contingent consideration payments 8,000   8,000   $ 9,600
Contingent consideration arrangements maximum payments amount 14,800   14,800    
Contingent consideration     $ 2,000 4,416  
Number of acquisition immaterial | acquisition     4    
Cash, net of cash acquired     $ 123,382 22,350  
Contingent consideration, performance period         1 year
Amortization expense 500 $ 1,400 2,200 $ 4,000  
Acquired Entities          
Business Acquisition [Line Items]          
Excluding assessed tax 19,600   23,300    
Operating Income (Loss) 2,100   2,200    
Contingent consideration     1,813   $ 1,160
Cash, net of cash acquired     124,013   $ 53,307
Contingent consideration, performance period         1 year
Acquired Entities | Previously Reported          
Business Acquisition [Line Items]          
Cash, net of cash acquired         $ 53,100
Accrued Liabilities          
Business Acquisition [Line Items]          
Fair value of estimated contingent consideration payments 6,100   6,100   2,000
Other Long-term Liabilities          
Business Acquisition [Line Items]          
Fair value of estimated contingent consideration payments $ 1,900   $ 1,900   $ 7,600