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BUSINESS ACQUISITIONS - Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended 9 Months Ended
Aug. 28, 2019
USD ($)
Apr. 29, 2019
USD ($)
Apr. 03, 2018
USD ($)
Jan. 11, 2018
USD ($)
Sep. 28, 2019
USD ($)
Mar. 30, 2019
USD ($)
Mar. 30, 2019
GBP (£)
Sep. 29, 2018
USD ($)
Sep. 28, 2019
USD ($)
Sep. 29, 2018
USD ($)
Sep. 29, 2018
GBP (£)
Jan. 11, 2018
GBP (£)
Citoxlab                        
Business Acquisition [Line Items]                        
Purchase price   $ 527,700                    
Purchase price allocation   491,007                    
Cash acquired   36,700                    
Goodwill, amount expected to be deductible for tax purposes   $ 7,200                    
Integration related costs and transaction costs         $ 1,900       $ 19,100      
Actual revenue from acquiree         44,000       74,900      
Operating income from acquiree         200       2,200      
Weighted average amortization life of intangible assets acquired   12 years                    
Citoxlab | Client relationships                        
Business Acquisition [Line Items]                        
Weighted average amortization life of intangible assets acquired   13 years                    
MPI Research                        
Business Acquisition [Line Items]                        
Purchase price     $ 829,700                  
Purchase price allocation     800,800                  
Cash acquired     27,700                  
Goodwill, amount expected to be deductible for tax purposes     4,100                  
Integration related costs and transaction costs         0     $ 800 0 $ 15,300    
Adjustments related to prior period     $ 1,200                  
Weighted average amortization life of intangible assets acquired     12 years                  
MPI Research | Client relationships                        
Business Acquisition [Line Items]                        
Weighted average amortization life of intangible assets acquired     13 years                  
KWS BioTest Limited                        
Business Acquisition [Line Items]                        
Purchase price       $ 20,300                
Purchase price allocation       21,529                
Cash acquired       1,000                
Integration related costs and transaction costs         0     100 $ 0 600    
Adjustments related to prior period       $ 400                
Undiscounted contingent payments               $ 2,600   2,600 £ 2.0 £ 3.0
Payments for contingent liabilities           $ 2,600 £ 2.0          
KWS BioTest Limited | Client relationships                        
Business Acquisition [Line Items]                        
Weighted average amortization life of intangible assets acquired                 12 years      
Other Acquisitions                        
Business Acquisition [Line Items]                        
Purchase price $ 23,400                      
Purchase price allocation 23,063                      
Cash acquired 300                      
Integration related costs and transaction costs         $ 2,100       $ 3,200      
Prepayments for future purchases and other post-closing adjustments $ 4,000                      
Depreciation and Amortization Expense | Citoxlab                        
Business Acquisition [Line Items]                        
Adjustments related to prior period                 4,800 7,300    
Depreciation and Amortization Expense | MPI Research                        
Business Acquisition [Line Items]                        
Adjustments related to prior period                   11,800    
Interest Expense | Citoxlab                        
Business Acquisition [Line Items]                        
Adjustments related to prior period                 $ 1,200 3,100    
Interest Expense | MPI Research                        
Business Acquisition [Line Items]                        
Adjustments related to prior period                   $ 2,800    
Supplier                        
Business Acquisition [Line Items]                        
Ownership percentage 80.00%                      
Noncontrolling interest ownership percentage 20.00% 20.00%                    
Supplier | Other Acquisitions                        
Business Acquisition [Line Items]                        
Ownership percentage 80.00%                      
Noncontrolling interest ownership percentage 20.00%