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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
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