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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015 item segment	Dec. 28, 2013 item	Dec. 29, 2012 item
Description of Business
Number of broad areas of services									2crai_NumberOfAreasOfServices
Number of business segments									1us-gaap_NumberOfReportableSegments
Fiscal Year Change
Number of weeks periodically contained in a fiscal year									53crai_NumberOfWeeksPeriodicallyContainedInFiscalYear
Number of weeks in a fiscal year									52crai_NumberOfWeeksInFiscalYear	52crai_NumberOfWeeksInFiscalYear	52crai_NumberOfWeeksInFiscalYear
NeuCo Interest
Net revenue	$ 78,459us-gaap_SalesRevenueServicesNet	$ 73,483us-gaap_SalesRevenueServicesNet	$ 78,184us-gaap_SalesRevenueServicesNet	$ 76,245us-gaap_SalesRevenueServicesNet	$ 75,672us-gaap_SalesRevenueServicesNet	$ 74,427us-gaap_SalesRevenueServicesNet	$ 65,203us-gaap_SalesRevenueServicesNet	$ 63,130us-gaap_SalesRevenueServicesNet	$ 306,371us-gaap_SalesRevenueServicesNet	$ 278,432us-gaap_SalesRevenueServicesNet	$ 270,390us-gaap_SalesRevenueServicesNet
Net income	3,743us-gaap_ProfitLoss	3,189us-gaap_ProfitLoss	3,167us-gaap_ProfitLoss	3,308us-gaap_ProfitLoss	3,716us-gaap_ProfitLoss	3,333us-gaap_ProfitLoss	1,351us-gaap_ProfitLoss	2,835us-gaap_ProfitLoss	13,407us-gaap_ProfitLoss	11,235us-gaap_ProfitLoss	(52,843)us-gaap_ProfitLoss
Net income attributable to CRA International, Inc.	3,816us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,224us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,188us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,410us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,722us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,270us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	1,409us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	2,969us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	13,638us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	11,370us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(52,990)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Repayments of Notes Payable									26us-gaap_RepaymentsOfNotesPayable	700us-gaap_RepaymentsOfNotesPayable	650us-gaap_RepaymentsOfNotesPayable
NeuCo, Inc.
NeuCo Interest
Percentage of ownership interest held by the entity									55.89%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net revenue									4,800us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	5,100us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	5,500us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income									(500)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(300)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	300us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income attributable to CRA International, Inc.									$ (200)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ (200)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 200us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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