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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Quarterly Financial Data (Unaudited)
Revenues	$ 119,262	$ 115,686	$ 110,573	$ 105,849	$ 108,763	$ 103,871	$ 105,538	$ 99,476	$ 451,370	$ 417,648	$ 370,075
Income from operations	7,277	6,905	8,311	6,855	7,845	5,225	9,661	6,204	29,348	28,935	15,764
Income before provision for income taxes	6,059	6,691	7,947	6,100	8,331	4,939	9,737	5,926	26,797	28,933	15,164
Net income	$ 4,763	$ 5,739	$ 5,580	$ 4,665	6,839	3,908	6,839	4,886	20,747	22,472	7,701
Net loss attributable to noncontrolling interest, net of tax					20	0	0	0		20	(77)
Net income attributable to CRA International, Inc					$ 6,859	$ 3,908	$ 6,839	$ 4,886	$ 20,747	$ 22,492	$ 7,624
Basic net income per share (in dollars per share)	$ 0.61	$ 0.74	$ 0.70	$ 0.58	$ 0.85	$ 0.48	$ 0.84	$ 0.59	$ 2.63	$ 2.76	$ 0.91
Diluted net income per share (in dollars per share)	$ 0.59	$ 0.71	$ 0.68	$ 0.56	$ 0.81	$ 0.46	$ 0.79	$ 0.57	$ 2.53	$ 2.61	$ 0.89

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