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Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 04, 2015 | Jun. 28, 2014 | Jul. 04, 2015 | Jun. 28, 2014
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] |  |  |  |
Net income attributable to CRA International, Inc. allocated to common shares | $ 3,325 | $ 3,188 | $ 6,104 | $ 6,598
Less: net income attributable to CRA International, Inc. allocated to unvested shares |  |  | (47) |
Net income attributable to CRA International, Inc. allocated to common shares |  |  | $ 6,057 |
Weighted Average Number of Shares Outstanding, Diluted [Abstract] |  |  |  |
Net income attributable to CRA International, Inc. allocated to common shares (in shares) |  |  | 9,183,000 |
Less: net income attributable to CRA International, Inc. allocated to unvested shares (in shares) |  |  | (71,000) |
Net income attributable to CRA International, Inc. allocated to common shares (in shares) | 9,034,000 | 9,919,000 | 9,112,000 | 9,974,000
Income (Loss) from Operations before Extraordinary Items, Per Basic Share [Abstract] |  |  |  |
Net income attributable to CRA International, Inc. allotted to common shares (in dollars per share) | $ 0.37 | $ 0.32 | $ 0.66 | $ 0.66
Reconciliation of basic to diluted weighted average shares of common stock outstanding |  |  |  |
Basic weighted average shares outstanding | 9,034,000 | 9,919,000 | 9,112,000 | 9,974,000
Common stock equivalents: |  |  |  |
Stock options, restricted shares, and restricted stock units (in shares) | 219,000 | 107,000 | 216,000 | 93,000
Diluted weighted average shares outstanding | 9,253,000 | 10,026,000 | 9,328,000 | 10,067,000
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding |  |  |  |
Anti-dilutive securities excluded from EPS computation (in shares) | 371,421 | 888,746 | 381,577 | 1,088,180

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