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Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Revenue recognition |  |  |
Reimbursable expenses | $ 36,676 us-gaap_ReimbursementRevenue | $ 37,320 us-gaap_ReimbursementRevenue | $ 33,530 us-gaap_ReimbursementRevenue
Revenues | Fixed-price engagements |  |  |
Revenue recognition |  |  |
Percentage of consolidated revenues | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = crai_FixedPriceContractsConcentrationRiskMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = crai_FixedPriceContractsConcentrationRiskMember | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = crai_FixedPriceContractsConcentrationRiskMember
Minimum |  |  |
Revenue recognition |  |  |
Period in which engagements are generally completed | 3 months |  |
Maximum |  |  |
Revenue recognition |  |  |
Period in which engagements are generally completed | 6 months |  |

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