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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2024
Apr. 01, 2023
Statement of Comprehensive Income [Abstract]    
Net income $ 74,482 $ 103,954
Other comprehensive income (loss):    
Foreign currency translation adjustment (62,840) 23,313
Amortization of net loss, settlement losses, and prior service benefit included in total cost for pension and other post-retirement benefit plans 344 170
Unrealized gains (losses) on hedging instruments 768 (1,402)
Other comprehensive income (loss), before income taxes (61,728) 22,081
Less: Income tax benefit related to items of other comprehensive income (5,473) (1,038)
Comprehensive income, net of income taxes 18,227 127,073
Less: Comprehensive income (loss) related to noncontrolling interests, net of income taxes (1,241) 1,009
Comprehensive income attributable to Charles River Laboratories International, Inc., net of income taxes $ 19,468 $ 126,064