Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Condensed Consolidated Income Statements
Revenues	$ 76,525	$ 73,483	$ 231,099	$ 227,912
Costs of services	52,029	49,417	156,523	153,952
Gross profit	24,496	24,066	74,576	73,960
Selling, general and administrative expenses	18,355	16,674	55,105	51,297
Depreciation and amortization	1,560	1,597	4,766	4,746
Income from operations	4,581	5,795	14,705	17,917
Interest income	6	29	34	107
Interest expense	(146)	(162)	(437)	(453)
Gain on extinguishment of debt			606
Other expense, net	(95)	(87)	(540)	(278)
Income before provision for income taxes	4,346	5,575	14,368	17,293
Provision for income taxes	(1,533)	(2,386)	(5,454)	(7,629)
Net income	2,813	3,189	8,914	9,664
Net loss attributable to noncontrolling interest, net of tax	47	35	50	158
Net income attributable to CRA International, Inc.	$ 2,860	$ 3,224	$ 8,964	$ 9,822
Net income per share attributable to CRA International, Inc.:
Basic (in dollars per share)	$ 0.32	$ 0.33	$ 0.98	$ 0.99
Diluted (in dollars per share)	$ 0.31	$ 0.33	$ 0.97	$ 0.98
Weighted average number of shares outstanding:
Basic (in shares)	8,940	9,729	9,055	9,892
Diluted (in shares)	9,025	9,919	9,182	10,018