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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 |  |  |  |  |  |  |  |  | 2 crai_NumberOfAreasOfServices |  |
Number of business segments |  |  |  |  |  |  |  |  | 1 us-gaap_NumberOfReportableSegments |  |
Fiscal Year Change |  |  |  |  |  |  |  |  |  |  |
Number of weeks periodically contained in a fiscal year |  |  |  |  |  |  |  |  | 53 crai_NumberOfWeeksPeriodicallyContainedInFiscalYear |  |
Number of weeks in a fiscal year |  |  |  |  |  |  |  |  | 52 crai_NumberOfWeeksInFiscalYear | 52 crai_NumberOfWeeksInFiscalYear | 52 crai_NumberOfWeeksInFiscalYear
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 78,459 us-gaap_SalesRevenueServicesNet | $ 73,483 us-gaap_SalesRevenueServicesNet | $ 78,184 us-gaap_SalesRevenueServicesNet | $ 76,245 us-gaap_SalesRevenueServicesNet | $ 75,672 us-gaap_SalesRevenueServicesNet | $ 74,427 us-gaap_SalesRevenueServicesNet | $ 65,203 us-gaap_SalesRevenueServicesNet | $ 63,130 us-gaap_SalesRevenueServicesNet | $ 306,371 us-gaap_SalesRevenueServicesNet | $ 278,432 us-gaap_SalesRevenueServicesNet | $ 270,390 us-gaap_SalesRevenueServicesNet
Net income | 3,743 us-gaap_ProfitLoss | 3,189 us-gaap_ProfitLoss | 3,167 us-gaap_ProfitLoss | 3,308 us-gaap_ProfitLoss | 3,716 us-gaap_ProfitLoss | 3,333 us-gaap_ProfitLoss | 1,351 us-gaap_ProfitLoss | 2,835 us-gaap_ProfitLoss | 13,407 us-gaap_ProfitLoss | 11,235 us-gaap_ProfitLoss | (52,843)us-gaap_ProfitLoss
Net income attributable to CRA International, Inc. | 3,816 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 3,224 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 3,188 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 3,410 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 3,722 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 3,270 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,409 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 2,969 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 13,638 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 11,370 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (52,990)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Repayments of Notes Payable |  |  |  |  |  |  |  |  | 26 us-gaap_RepaymentsOfNotesPayable | 700 us-gaap_RepaymentsOfNotesPayable | 650 us-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 |  |  |  |  |  |  |  |  | 4,800 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 5,100 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 5,500 us-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 | 300 us-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 | $ 200 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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