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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Income Statement [Abstract]
Revenues	$ 508,373	$ 451,370	$ 417,648
Costs of services (exclusive of depreciation and amortization)	370,709	317,761	289,185
Selling, general and administrative expenses	90,028	93,613	89,533
Depreciation and amortization	12,840	10,648	9,995
Income from operations	34,796	29,348	28,935
GNU gain on liquidation	0	0	258
Interest expense, net	(1,216)	(1,254)	(647)
Foreign currency gains (losses), net	42	(1,297)	387
Income before provision for income taxes	33,622	26,797	28,933
Provision for income taxes	9,115	6,050	6,461
Net income	24,507	20,747	22,472
Net loss attributable to noncontrolling interest, net of tax	0	0	20
Net income attributable to CRA International, Inc.	$ 24,507	$ 20,747	$ 22,492
Net income per share attributable to CRA International, Inc.:
Basic (in dollars per share)	$ 3.14	$ 2.63	$ 2.76
Diluted (in dollars per share)	$ 3.07	$ 2.53	$ 2.61
Weighted average number of shares outstanding:
Basic (in shares)	7,768	7,866	8,107
Diluted (in shares)	7,948	8,167	8,570

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