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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 72,460 | $ 76,525 | $ 76,535 | $ 78,039 | $ 78,459 | $ 73,483 | $ 78,184 | $ 76,245 | $ 303,559 | $ 306,371 | $ 278,432
Gross profit | 21,333 | 24,496 | 25,860 | 24,220 | 25,598 | 24,066 | 25,515 | 24,379 | 95,909 | 99,558 | 89,170
Income (loss) from operations | (2,310) | 4,581 | 5,648 | 4,476 | 6,124 | 5,795 | 6,493 | 5,629 | 12,394 | 24,041 | 18,517
Income (loss) before provision (benefit) for income taxes | (2,553) | 4,346 | 5,391 | 4,631 | 6,022 | 5,575 | 6,334 | 5,384 | 11,815 | 23,315 | 17,918
Net income (loss) | (2,589) | 2,813 | 3,202 | 2,899 | 3,743 | 3,189 | 3,167 | 3,308 | 6,325 | 13,407 | 11,235
Net loss attributable to noncontrolling interest, net of tax | 1,282 | 47 | 123 | (120) | 73 | 35 | 21 | 102 | 1,332 | 231 | 135
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
Net income (loss) attributable to CRA International, Inc. allocated to common shares; and basic earnings (loss) per common share (in dollars per share) | $ (0.15) | $ 0.32 | $ 0.37 | $ 0.30 | $ 0.41 | $ 0.33 | $ 0.32 | $ 0.34 | $ 0.84 | $ 1.40 | $ 1.13
Net income (loss) attributable to CRA International, Inc. allocated to common shares; and diluted earnings (loss) per common share (in dollars per share) | $ (0.15) | $ 0.31 | $ 0.36 | $ 0.30 | $ 0.40 | $ 0.33 | $ 0.32 | $ 0.34 | $ 0.83 | $ 1.38 | $ 1.12
NeuCo goodwill impairment | $ 4,500 |  |  |  |  |  |  |  | $ 4,524 |  |
Net charge after considering taxes and allocation of net loss to noncontrolling interest | 1,600 |  |  |  |  |  |  |  |  |  |
Net adjustments relating to reimbursable revenue and expense error correction | $ 500 |  |  |  |  |  |  |  |  |  |
Deferred tax assets valuation error correction |  |  |  |  |  |  | $ 800 |  |  |  |
Weighted average number of shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 8,876 | 8,940 | 9,034 | 9,190 | 9,344 | 9,729 | 9,919 | 10,029 | 9,010 | 9,747 | 10,084
Diluted (in shares) | 8,876 | 9,025 | 9,253 | 9,403 | 9,560 | 9,919 | 10,026 | 10,108 | 9,195 | 9,897 | 10,173

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