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PROPERTY, PLANT AND EQUIPMENT, NET - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Dec. 29, 2024
Dec. 28, 2024
Property, Plant and Equipment [Line Items]        
Depreciation $ 43,400 $ 45,700    
Net income available to Charles River Laboratories International, Inc. common shareholders $ 25,469 $ 67,329    
Basic (in dollars per share) $ 0.50 $ 1.31    
Diluted (in dollars per share) $ 0.50 $ 1.30    
Disposal Group, Held-for-Sale, Not Discontinued Operations        
Property, Plant and Equipment [Line Items]        
Assets held for sale $ 20,000      
Service Life        
Property, Plant and Equipment [Line Items]        
Depreciation (4,500)      
Net income available to Charles River Laboratories International, Inc. common shareholders $ 3,400      
Basic (in dollars per share) $ 0.07      
Diluted (in dollars per share) $ 0.07      
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