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BUSINESS COMBINATIONS - Purchase Price Allocations (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Aug. 06, 2020
Jan. 03, 2020
Dec. 28, 2019
Aug. 28, 2019
Apr. 29, 2019
Dec. 29, 2018
Apr. 03, 2018
Business Acquisition [Line Items]                
Goodwill $ 1,809,168     $ 1,540,565     $ 1,247,133  
Cellero, LLC                
Business Acquisition [Line Items]                
Trade receivables   $ 1,500            
Inventories   551            
Other current assets (excluding cash)   182            
Property, plant and equipment   1,648            
Goodwill   19,457            
Definite-lived intangible assets   16,230            
Other long-term assets   849            
Current liabilities   (1,360)            
Deferred tax liabilities   (1,467)            
Other long-term liabilities   (740)            
Total purchase price allocation   $ 36,850            
HemaCare Corporation                
Business Acquisition [Line Items]                
Trade receivables     $ 6,451          
Inventories     8,468          
Other current assets (excluding cash)     3,494          
Property, plant and equipment     10,033          
Goodwill     210,196          
Definite-lived intangible assets     183,540          
Other long-term assets     5,920          
Current liabilities     (5,188)          
Deferred tax liabilities     (38,529)          
Other long-term liabilities     (7,664)          
Total purchase price allocation     $ 376,721          
Citoxlab                
Business Acquisition [Line Items]                
Trade receivables           $ 35,405    
Inventories           5,282    
Other current assets (excluding cash)           13,917    
Property, plant and equipment           88,605    
Goodwill           280,161    
Definite-lived intangible assets           162,400    
Other long-term assets           20,063    
Deferred revenue           (15,278)    
Current liabilities           (46,081)    
Deferred tax liabilities           (27,458)    
Other long-term liabilities           (22,624)    
Redeemable noncontrolling interest           (4,035)    
Total purchase price allocation           $ 490,357    
MPI Research                
Business Acquisition [Line Items]                
Trade receivables               $ 35,073
Inventories               4,463
Other current assets (excluding cash)               5,893
Property, plant and equipment               128,403
Goodwill               441,656
Definite-lived intangible assets               309,200
Other long-term assets               1,081
Deferred revenue               (23,926)
Current liabilities               (32,885)
Deferred tax liabilities               (65,945)
Other long-term liabilities               (2,213)
Total purchase price allocation               $ 800,800
Other Acquisitions                
Business Acquisition [Line Items]                
Goodwill         $ 13,000      
Other long-term assets         12,000      
Redeemable noncontrolling interest         $ (9,000)