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Condensed Consolidated Satamens of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Condensed Consolidated Statements of Operations
Revenues	$ 78,039us-gaap_SalesRevenueServicesNet	$ 76,245us-gaap_SalesRevenueServicesNet
Costs of services	53,819us-gaap_CostOfServices	51,866us-gaap_CostOfServices
Gross profit	24,220us-gaap_GrossProfit	24,379us-gaap_GrossProfit
Selling, general and administrative expenses	18,083us-gaap_SellingGeneralAndAdministrativeExpense	17,160us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization	1,661us-gaap_DepreciationAndAmortization	1,590us-gaap_DepreciationAndAmortization
Income from operations	4,476us-gaap_OperatingIncomeLoss	5,629us-gaap_OperatingIncomeLoss
Interest income	17us-gaap_InvestmentIncomeInterest	39us-gaap_InvestmentIncomeInterest
Interest expense	(142)us-gaap_InterestExpenseDebt	(164)us-gaap_InterestExpenseDebt
Gain on extinguishment of debt	606us-gaap_GainsLossesOnExtinguishmentOfDebt
Other expense, net	(326)us-gaap_OtherNonoperatingIncomeExpense	(120)us-gaap_OtherNonoperatingIncomeExpense
Income before provision for income taxes	4,631us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	5,384us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes	(1,732)us-gaap_IncomeTaxExpenseBenefit	(2,076)us-gaap_IncomeTaxExpenseBenefit
Net income	2,899us-gaap_ProfitLoss	3,308us-gaap_ProfitLoss
Net (income) loss attributable to noncontrolling interest, net of tax	(120)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	102us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to CRA International, Inc.	$ 2,779us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,410us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income per share attributable to CRA International, Inc.:
Basic (in dollars per share)	$ 0.30us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.34us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted (in dollars per share)	$ 0.30us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.34us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Weighted average number of shares outstanding:
Basic (in shares)	9,190us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,029us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	9,403us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,108us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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