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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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 segment | Dec. 29, 2012 item | Dec. 31, 2011 item
Description of Business |  |  |  |  |  |  |  |  |  |  |
Number of broad areas of services |  |  |  |  |  |  |  |  | 2 |  |
Number of business segments |  |  |  |  |  |  |  |  | 1 |  |
Fiscal Year Change |  |  |  |  |  |  |  |  |  |  |
Number of weeks periodically contained in a fiscal year |  |  |  |  |  |  |  |  | 53 |  |
Number of weeks in a fiscal year |  |  |  |  |  |  |  |  | 52 | 52 | 52
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 75,672 | $ 74,427 | $ 65,203 | $ 63,130 | $ 67,533 | $ 65,912 | $ 67,813 | $ 69,132 | $ 278,432 | $ 270,390 | $ 305,228
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 CRA International, Inc. | 3,722 | 3,270 | 1,409 | 2,969 | (53,484) | (744) | 719 | 519 | 11,370 | (52,990) | 16,851
NeuCo, Inc. |  |  |  |  |  |  |  |  |  |  |
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest held by the entity |  |  |  |  |  |  |  |  | 55.89% |  |
Net revenue |  |  |  |  |  |  |  |  | 5,100 | 5,500 | 6,200
Net income (loss) |  |  |  |  |  |  |  |  | (300) | 300 | 200
Net income (loss) attributable to CRA International, Inc. |  |  |  |  |  |  |  |  | $ (200) | $ 200 | $ 100

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