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Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 28, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 29, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 28, 2013 item | Dec. 29, 2012 | Dec. 31, 2011
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 75,672 | $ 74,427 | $ 65,203 | $ 63,130 | $ 67,533 | $ 65,912 | $ 67,813 | $ 69,132 | $ 278,432 | $ 270,390 | $ 305,228
Gross profit | 24,044 | 23,850 | 20,161 | 21,115 | 23,262 | 19,737 | 22,365 | 22,645 | 89,170 | 88,009 | 105,845
Income (loss) from operations | 5,459 | 6,114 | 3,170 | 3,774 | (64,959) | 1,035 | 2,808 | 3,306 | 18,517 | (57,810) | 29,064
Income (loss) before (provision) benefit for income taxes | 5,221 | 5,952 | 3,368 | 3,377 | (64,987) | 1,016 | 2,695 | 3,253 | 17,918 | (58,023) | 28,083
Net income (loss) | 3,716 | 3,333 | 1,351 | 2,835 | (53,346) | (706) | 773 | 436 | 11,235 | (52,843) | 16,945
Net (income) loss attributable to noncontrolling interest, net of tax | 6 | (63) | 58 | 134 | (138) | (38) | (54) | 83 | 135 | (147) | (94)
Net income (loss) attributable to CRA International, Inc. | $ 3,722 | $ 3,270 | $ 1,409 | $ 2,969 | $ (53,484) | $ (744) | $ 719 | $ 519 | $ 11,370 | $ (52,990) | $ 16,851
Basic net income (loss) per share (in dollars per share) | $ 0.37 | $ 0.32 | $ 0.14 | $ 0.30 | $ (5.33) | $ (0.07) | $ 0.07 | $ 0.05 | $ 1.13 | $ (5.21) | $ 1.60
Diluted net income (loss) per share (in dollars per share) | $ 0.37 | $ 0.32 | $ 0.14 | $ 0.29 | $ (5.33) | $ (0.07) | $ 0.07 | $ 0.05 | $ 1.12 | $ (5.21) | $ 1.57
Weighted average number of shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 10,071 | 10,093 | 10,100 | 9,994 | 10,027 | 10,084 | 10,242 | 10,316 | 10,084 | 10,167 | 10,555
Diluted (in shares) | 10,148 | 10,192 | 10,188 | 10,084 | 10,027 | 10,084 | 10,381 | 10,493 | 10,173 | 10,167 | 10,739
Number of quarters the sum of which may not equal the full year amount |  |  |  |  |  |  |  |  | 4 |  |

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