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EQUITY AND NONCONTROLLING INTERESTS - Schedule of Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Numerator:    
Net income $ 25,878 $ 74,482
Less: Net income attributable to noncontrolling interests 409 1,522
Net income attributable to Charles River Laboratories International, Inc. 25,469 72,960
Calculation of net income per share attributable to Charles River Laboratories International, Inc. common shareholders    
Net income attributable to Charles River Laboratories International, Inc. 25,469 72,960
Less: Adjustment of redeemable noncontrolling interests 0 401
Less: Incremental dividends attributed to noncontrolling interest holders 0 5,230
Net income available to Charles River Laboratories International, Inc. common shareholders $ 25,469 $ 67,329
Denominator:    
Weighted-average shares outstanding - Basic (in shares) 50,677 51,437
Effect of dilutive securities:    
Stock options, restricted stock units and performance share units (in shares) 176 405
Weighted-average shares outstanding - Diluted (in shares) 50,853 51,842
Anti-dilutive common stock equivalents (in shares) 958 448