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PROPERTY, PLANT AND EQUIPMENT, NET - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Dec. 29, 2024
Dec. 28, 2024
Property, Plant and Equipment [Line Items]            
Depreciation $ 44,800 $ 48,500 $ 132,500 $ 141,800    
Net income available to Charles River Laboratories International, Inc. common shareholders $ 54,422 $ 68,679 $ 132,217 $ 225,996    
Basic (in dollars per share) $ 1.11 $ 1.34 $ 2.66 $ 4.39    
Diluted (in dollars per share) $ 1.10 $ 1.33 $ 2.65 $ 4.37    
Disposal Group, Held-for-Sale, Not Discontinued Operations            
Property, Plant and Equipment [Line Items]            
Assets held for sale $ 20,000   $ 20,000      
Service Life            
Property, Plant and Equipment [Line Items]            
Depreciation (4,500)   (13,600)      
Net income available to Charles River Laboratories International, Inc. common shareholders $ 3,400   $ 10,300      
Basic (in dollars per share) $ 0.07   $ 0.21      
Diluted (in dollars per share) $ 0.07   $ 0.21      
Machinery and equipment            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life         7 years 5 years
Building Improvements            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life         15 years 10 years