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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 20, 2017 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 97,016 | $ 91,325 | $ 93,563 | $ 88,171 | $ 79,569 | $ 81,691 | $ 82,607 | $ 80,912 | $ 370,075 | $ 324,779 | $ 303,559
Income (loss) from operations |  | (642) | 5,647 | 5,848 | 4,911 | 3,615 | 5,297 | 5,680 | 4,326 | 15,764 | 18,919 | 12,394
Income (loss) before provision for income taxes |  | (898) | 5,535 | 5,919 | 4,608 | 3,375 | 5,060 | 9,269 | 4,185 | 15,164 | 21,889 | 11,815
Net income (loss) |  | (2,261) | 3,225 | 3,907 | 2,830 | 2,076 | 3,151 | 6,767 | 2,239 | 7,701 | 14,233 | 6,325
Net (income) loss attributable to noncontrolling interest, net of tax |  | 5 | (11) | (94) | 23 | (18) | 42 | (1,552) | 184 | (77) | (1,345) | 1,332
Net income attributable to CRA as reported |  | $ (2,256) | $ 3,214 | $ 3,813 | $ 2,853 | $ 2,058 | $ 3,193 | $ 5,215 | $ 2,423 | $ 7,624 | $ 12,888 | $ 7,657
Basic net income (loss) per share (in dollars per share) |  | $ (0.27) | $ 0.39 | $ 0.45 | $ 0.34 | $ 0.25 | $ 0.39 | $ 0.60 | $ 0.27 | $ 0.91 | $ 1.50 | $ 0.84
Diluted net income (loss) per share (in dollars per share) |  | $ (0.28) | $ 0.38 | $ 0.44 | $ 0.33 | $ 0.24 | $ 0.38 | $ 0.59 | $ 0.27 | $ 0.89 | $ 1.49 | $ 0.83
Weighted average number of shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) |  | 8,171 | 8,149 | 8,428 | 8,419 | 8,269 | 8,177 | 8,695 | 8,871 | 8,292 | 8,503 | 9,010
Diluted (in shares) |  | 8,171 | 8,353 | 8,618 | 8,621 | 8,443 | 8,309 | 8,779 | 8,927 | 8,497 | 8,601 | 9,195
Claims under the Transaction agreement with IQVIA Inc settled | $ 5,700 |  |  |  |  |  |  |  |  |  |  |

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