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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Revenues | $ 79,569 | $ 81,691 | $ 82,607 | $ 80,912 | $ 72,460 | $ 76,525 | $ 76,535 | $ 78,039 | $ 324,779 | $ 303,559 | $ 306,371
Gross profit | 23,486 | 23,859 | 24,657 | 25,397 | 21,333 | 24,496 | 25,860 | 24,220 | 97,399 | 95,909 | 99,558
Income (loss) from operations | 3,615 | 5,297 | 5,680 | 4,326 | (2,310) | 4,581 | 5,648 | 4,476 | 18,919 | 12,394 | 24,041
Income (loss) before provision for income taxes | 3,375 | 5,060 | 9,269 | 4,185 | (2,553) | 4,346 | 5,391 | 4,631 | 21,889 | 11,815 | 23,315
Net income (loss) | 2,076 | 3,151 | 6,767 | 2,239 | (2,589) | 2,813 | 3,202 | 2,899 | 14,233 | 6,325 | 13,407
Net (income) loss attributable to noncontrolling interest, net of tax | (18) | 42 | (1,552) | 184 | 1,282 | 47 | 123 | (120) | (1,345) | 1,332 | 231
Net income attributable to CRA International, Inc | $ 2,058 | $ 3,193 | $ 5,215 | $ 2,423 | $ (1,307) | $ 2,860 | $ 3,325 | $ 2,779 | $ 12,888 | $ 7,657 | $ 13,638
Basic net income (loss) per share (in dollars per share) | $ 0.25 | $ 0.39 | $ 0.60 | $ 0.27 | $ (0.15) | $ 0.32 | $ 0.37 | $ 0.30 | $ 1.50 | $ 0.84 | $ 1.40
Diluted net income (loss) per share (in dollars per share) | $ 0.24 | $ 0.38 | $ 0.59 | $ 0.27 | $ (0.15) | $ 0.31 | $ 0.36 | $ 0.30 | $ 1.49 | $ 0.83 | $ 1.38
GNU goodwill impairment |  |  |  |  | $ 4,500 |  |  |  |  | $ 4,524 |
Net charge after considering taxes and allocation of net loss to noncontrolling interest |  |  |  |  | $ 1,600 |  |  |  |  |  |
Weighted average number of shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 8,269 | 8,177 | 8,695 | 8,871 | 8,876 | 8,940 | 9,034 | 9,190 | 8,503 | 9,010 | 9,747
Diluted (in shares) | 8,443 | 8,309 | 8,779 | 8,927 | 8,876 | 9,025 | 9,253 | 9,403 | 8,601 | 9,195 | 9,897
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 700 |  |  |  |  |  |
Income (loss) before provision for income taxes |  |  |  |  | $ 300 |  |  |  |  |  |

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