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BUSINESS COMBINATIONS - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 28, 2021
Mar. 30, 2021
Mar. 29, 2021
Mar. 03, 2021
Dec. 31, 2020
Aug. 06, 2020
Jan. 03, 2020
Sep. 25, 2021
Sep. 26, 2020
Sep. 25, 2021
Sep. 26, 2020
Dec. 26, 2020
Business Acquisition [Line Items]                        
Goodwill               $ 2,736,322   $ 2,736,322   $ 1,809,168
Vigene Biosciences, Inc.                        
Business Acquisition [Line Items]                        
Purchase price $ 326,100                      
Cash acquired 2,700                      
Contingent consideration liability 34,500                      
Consideration contingent upon future performance 57,500                      
Integration related costs and transaction costs               1,900   4,400    
Revenue from acquiree included in operating results               6,000        
Operating income (loss) from acquiree included in operating results               (2,600)        
Goodwill 242,822                      
Definite-lived intangible assets $ 93,600                      
Weighted-average amortization life 11 years                      
Property, plant and equipment $ 7,649                      
Retrogenix Limited                        
Business Acquisition [Line Items]                        
Purchase price   $ 53,900                    
Cash acquired   8,500                    
Consideration contingent upon future performance   6,900                    
Integration related costs and transaction costs               100   1,700    
Goodwill   34,489                    
Definite-lived intangible assets   $ 22,126                    
Weighted-average amortization life   11 years                    
Property, plant and equipment   $ 400                    
Cognate BioServices, Inc.                        
Business Acquisition [Line Items]                        
Purchase price     $ 876,100                  
Cash acquired     70,500                  
Integration related costs and transaction costs               4,300   22,700    
Revenue from acquiree included in operating results               30,300   65,100    
Operating income (loss) from acquiree included in operating results               (800)   300    
Value of consideration not acquired     $ 15,700                  
Ownership percentage not acquired     2.00%                  
Goodwill     $ 608,792                  
Definite-lived intangible assets     $ 270,900                  
Weighted-average amortization life     13 years                  
Property, plant and equipment     $ 52,082                  
Distributed Bio, Inc.                        
Business Acquisition [Line Items]                        
Purchase price         $ 97,000              
Cash acquired         800              
Contingent consideration liability         14,000              
Consideration contingent upon future performance         21,000              
Integration related costs and transaction costs               100   900    
Cash portion of consideration transferred         80,800              
Payments to settle promissory note         3,000              
Goodwill         71,585              
Definite-lived intangible assets         $ 24,540              
Weighted-average amortization life         7 years              
Property, plant and equipment         $ 2,382              
Other Acquisitions                        
Business Acquisition [Line Items]                        
Purchase price       $ 35,400                
Contingent consideration liability       15,900                
Consideration contingent upon future performance       17,500                
Cash portion of consideration transferred       $ 19,500               $ 5,500
Future performance period       3 years                
Goodwill       $ 17,300                
Definite-lived intangible assets       15,200                
Property, plant and equipment       $ 3,000                
Other Acquisitions | Supplier Relationships                        
Business Acquisition [Line Items]                        
Weighted-average amortization life       4 years                
Cognate BioServices, Inc. and Viegene Biosciences, Inc. | Depreciation and Amortization Expense                        
Business Acquisition [Line Items]                        
Adjustments related to prior period                   17,600 $ 19,500  
Cognate BioServices, Inc. and Viegene Biosciences, Inc. | Interest Expense                        
Business Acquisition [Line Items]                        
Adjustments related to prior period                   5,600 7,700  
Cellero, LLC                        
Business Acquisition [Line Items]                        
Purchase price           $ 36,900            
Cash acquired           500            
Integration related costs and transaction costs               100 $ 2,000 700 2,000  
Goodwill           19,457            
Definite-lived intangible assets           $ 16,230            
Weighted-average amortization life           12 years            
Property, plant and equipment           $ 1,648            
Goodwill, amount expected to be deductible for tax purposes           $ 10,800            
HemaCare Corporation                        
Business Acquisition [Line Items]                        
Purchase price             $ 376,700          
Cash acquired             3,100          
Integration related costs and transaction costs               $ 100 $ 100 $ 500 5,900  
Goodwill             210,196          
Definite-lived intangible assets             $ 183,540          
Weighted-average amortization life             18 years          
Property, plant and equipment             $ 10,033          
HemaCare Corporation | Depreciation and Amortization Expense                        
Business Acquisition [Line Items]                        
Adjustments related to prior period                     $ 400