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PROPERTY, PLANT AND EQUIPMENT, NET - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Dec. 29, 2024
Dec. 28, 2024
Property, Plant and Equipment [Line Items]            
Depreciation $ 44,300 $ 47,600 $ 87,700 $ 93,300    
Net income available to Charles River Laboratories International, Inc. common shareholders $ 52,326 $ 89,988 $ 77,795 $ 157,317    
Basic (in dollars per share) $ 1.06 $ 1.75 $ 1.56 $ 3.06    
Diluted (in dollars per share) $ 1.06 $ 1.74 $ 1.55 $ 3.04    
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)   (9,000)      
Net income available to Charles River Laboratories International, Inc. common shareholders $ 3,400   $ 6,900      
Basic (in dollars per share) $ 0.07   $ 0.14      
Diluted (in dollars per share) $ 0.07   $ 0.14      
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