Condensed Consolidated Statement of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	CRA International, Inc. Shareholders' Equity	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interest
BALANCE at Dec. 28, 2013	$ 224,637	$ 223,798	$ 93,242	$ 133,980	$ (3,424)	$ 839
BALANCE (in shares) at Dec. 28, 2013	10,048,611		10,048,611
Increase (Decrease) in Shareholders' Equity
Net income	6,475	6,598		6,598		(123)
Foreign currency translation adjustment	869	869			869
Issuance of common stock in connection with business acquisition	427	427	427
Issuance of common stock in connection with business acquisition (in shares)			22,520
Share-based compensation expense for employees	2,522	2,522	2,522
Restricted share vesting (in shares)			39,777
Redemption of vested employee restricted shares for tax withholding	(143)	(143)	(143)
Redemption of vested employee restricted shares for tax withholding (in shares)			(6,373)
Tax deficit on stock options and restricted shares vesting	(227)	(227)	(227)
Shares repurchased	(5,526)	(5,526)	(5,526)
Shares repurchased (in shares)			(252,600)
Share-based compensation expense for non-employees	94	94	94
BALANCE at Jun. 28, 2014	$ 229,128	$ 228,412	$ 90,389	$ 140,578	$ (2,555)	$ 716
BALANCE (in shares) at Jun. 28, 2014	9,851,935		9,851,935