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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 24,507	$ 20,747	$ 22,472
Other comprehensive income (loss)
Foreign currency translation adjustments	3,280	831	(2,698)
Comprehensive income	27,787	21,578	19,774
Comprehensive loss attributable to noncontrolling interest	0	0	20
Comprehensive income attributable to CRA International, Inc.	$ 27,787	$ 21,578	$ 19,794

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