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Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Revenue recognition
Reimbursable expenses	$ 36,676us-gaap_ReimbursementRevenue	$ 37,320us-gaap_ReimbursementRevenue	$ 33,530us-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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