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EQUITY AND NONCONTROLLING INTERESTS - Reconciliation of Numerator and Denominator in the Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Numerator:      
Net income $ 25,291 $ 480,370 $ 492,608
Less: Net income attributable to noncontrolling interests 3,088 5,746 6,382
Net income attributable to Charles River Laboratories International Inc. 22,203 474,624 486,226
Calculation of net income per share attributable to Charles River Laboratories International Inc. common shareholders      
Net income attributable to Charles River Laboratories International Inc. 22,203 474,624 486,226
Less: Incremental dividends attributed to noncontrolling interest holders 11,906 0 0
Net income available to Charles River Laboratories International Inc. common shareholders $ 10,297 $ 474,624 $ 486,226
Denominator:      
Weighted-average shares outstanding—Basic (in shares) 51,380 51,227 50,812
Effect of dilutive securities:      
Stock options, restricted stock, restricted stock units and performance share units (in shares) 248 224 489
Weighted-average shares outstanding—Diluted (in shares) 51,628 51,451 51,301
Antidilutive common stock equivalents (in shares) 530 652 560