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EQUITY AND NONCONTROLLING INTERESTS - Schedule of Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Numerator:        
Net income $ 52,693 $ 94,261 $ 78,571 $ 168,743
Less: Net income attributable to noncontrolling interests 367 180 776 1,702
Net income attributable to Charles River Laboratories International, Inc. 52,326 94,081 77,795 167,041
Calculation of net income per share attributable to Charles River Laboratories International, Inc. common shareholders        
Net income attributable to Charles River Laboratories International, Inc. 52,326 94,081 77,795 167,041
Less: Adjustment of redeemable noncontrolling interests 0 301 0 702
Less: Incremental dividends attributed to noncontrolling interest holders 0 3,792 0 9,022
Net income available to Charles River Laboratories International, Inc. common shareholders $ 52,326 $ 89,988 $ 77,795 $ 157,317
Denominator:        
Weighted-average shares outstanding - Basic (in shares) 49,149 51,551 49,913 51,494
Effect of dilutive securities:        
Stock options, restricted stock units and performance share units (in shares) 167 295 176 316
Weighted-average shares outstanding - Diluted (in shares) 49,316 51,846 50,089 51,810
Anti-dilutive common stock equivalents (in shares) 1,128 506 1,003 482