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Net Income per Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2016 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Jan. 03, 2015 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Jan. 02, 2016 | Jan. 03, 2015 | Dec. 28, 2013
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to CRA International, Inc. | $ (1,307) | $ 2,860 | $ 3,325 | $ 2,779 | $ 3,816 | $ 3,224 | $ 3,188 | $ 3,410 | $ 7,657 | $ 13,638 | $ 11,370
Less: net income attributable to participating shares |  |  |  |  |  |  |  |  | 59 | 20 | 27
Net income available to common shareholders |  |  |  |  |  |  |  |  | $ 7,598 | $ 13,618 | $ 11,343
Reconciliation of basic to diluted weighted average shares of common stock outstanding |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding | 8,876,000 | 8,940,000 | 9,034,000 | 9,190,000 | 9,344,000 | 9,729,000 | 9,919,000 | 10,029,000 | 9,010,000 | 9,747,000 | 10,084,000
Common stock equivalents: |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock (in shares) |  |  |  |  |  |  |  |  | 185,000 | 150,000 | 89,000
Diluted weighted average shares outstanding | 8,876,000 | 9,025,000 | 9,253,000 | 9,403,000 | 9,560,000 | 9,919,000 | 10,026,000 | 10,108,000 | 9,195,000 | 9,897,000 | 10,173,000
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive securities excluded from EPS computation (in shares) |  |  |  |  |  |  |  |  | 522,593 | 764,748 | 1,138,411

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