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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
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segment
Dec. 29, 2012
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Dec. 31, 2011
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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