CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenues	$ 451,370	$ 417,648	$ 370,075
Costs of services (exclusive of depreciation and amortization)	317,761	289,185	258,829
Selling, general and administrative expenses	93,613	89,533	86,537
Depreciation and amortization	10,648	9,995	8,945
Income from operations	29,348	28,935	15,764
GNU gain on sale of business assets and subsequent liquidation		258	250
Interest expense, net	(1,254)	(647)	(484)
Foreign currency gains (losses), net	(1,297)	387	(366)
Income before provision for income taxes and noncontrolling interest	26,797	28,933	15,164
Provision for income taxes	6,050	6,461	7,463
Net income	20,747	22,472	7,701
Net (income) loss attributable to noncontrolling interest, net of tax		(20)	77
Net income attributable to CRA International, Inc.	$ 20,747	$ 22,492	$ 7,624
Net income per share attributable to CRA International, Inc.:
Basic (in dollars per share)	$ 2.63	$ 2.76	$ 0.91
Diluted (in dollars per share)	$ 2.53	$ 2.61	$ 0.89
Weighted average number of shares outstanding:
Basic (in shares)	7,866	8,107	8,292
Diluted (in shares)	8,167	8,570	8,497