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EQUITY AND NONCONTROLLING INTERESTS - Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 30, 2024
Apr. 01, 2023
Numerator:    
Net income $ 74,482 $ 103,954
Less: Net income attributable to noncontrolling interests 1,522 823
Net income available to Charles River Laboratories International, Inc. 72,960 103,131
Less: Adjustment of redeemable noncontrolling interest 401 0
Less: Incremental dividends attributable to noncontrolling interest holders 5,230 0
Net income available to Charles River Laboratories International, Inc. common shareholders $ 67,329 $ 103,131
Denominator:    
Weighted-average shares outstanding—Basic (in shares) 51,437 51,097
Effect of dilutive securities:    
Stock options, restricted stock units and performance share units (in shares) 405 331
Weighted-average shares outstanding—Diluted (in shares) 51,842 51,428
Anti-dilutive common stock equivalents (in shares) 448 405