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Income Taxes (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 | Dec. 28, 2013 | Dec. 29, 2012
Income (loss) before (provision) benefit for income taxes: |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  |  |  |  |  |  |  | $ 20,899 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 13,659 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ (27,290)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign |  |  |  |  |  |  |  |  | 2,416 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 4,259 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | (30,733)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income (loss) before (provision) benefit for income taxes | 6,022 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,575 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,334 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,384 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,221 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,952 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,368 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,377 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 23,315 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 17,918 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (58,023)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Components of income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 9,908 us-gaap_IncomeTaxExpenseBenefit | 6,683 us-gaap_IncomeTaxExpenseBenefit | (5,180)us-gaap_IncomeTaxExpenseBenefit
Currently payable: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 8,585 us-gaap_CurrentFederalTaxExpenseBenefit | 1,241 us-gaap_CurrentFederalTaxExpenseBenefit | 3,637 us-gaap_CurrentFederalTaxExpenseBenefit
Foreign |  |  |  |  |  |  |  |  | 876 us-gaap_CurrentForeignTaxExpenseBenefit | 1,264 us-gaap_CurrentForeignTaxExpenseBenefit | 50 us-gaap_CurrentForeignTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | 1,878 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 254 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 1,015 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Currently payable |  |  |  |  |  |  |  |  | 11,339 us-gaap_CurrentIncomeTaxExpenseBenefit | 2,759 us-gaap_CurrentIncomeTaxExpenseBenefit | 4,702 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (1,068)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 3,592 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (8,163)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign |  |  |  |  |  |  |  |  | (505)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (238)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 21 us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | 142 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 570 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (1,740)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred |  |  |  |  |  |  |  |  | (1,431)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 3,924 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | (9,882)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | $ 9,908 us-gaap_IncomeTaxExpenseBenefit | $ 6,683 us-gaap_IncomeTaxExpenseBenefit | $ (5,180)us-gaap_IncomeTaxExpenseBenefit
Reconciliation of tax rates with federal statutory rate |  |  |  |  |  |  |  |  |  |  |
Federal statutory rate (as a percent) |  |  |  |  |  |  |  |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal income tax benefit (as a percent) |  |  |  |  |  |  |  |  | 3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 4.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Goodwill impairment (as a percent) |  |  |  |  |  |  |  |  |  |  | 20.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses
Foreign losses benefited (as a percent) |  |  |  |  |  |  |  |  | (1.80%)crai_EffectiveIncomeTaxRateReconciliationForeignLossesBenefited | (2.80%)crai_EffectiveIncomeTaxRateReconciliationForeignLossesBenefited | (0.10%)crai_EffectiveIncomeTaxRateReconciliationForeignLossesBenefited
Losses not benefited (as a percent) |  |  |  |  |  |  |  |  | 0.60%crai_EffectiveIncomeTaxRateReconciliationLossesNotBenefited | 0.30%crai_EffectiveIncomeTaxRateReconciliationLossesNotBenefited | 4.20%crai_EffectiveIncomeTaxRateReconciliationLossesNotBenefited
Foreign rate differential (as a percent) |  |  |  |  |  |  |  |  | 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Foreign tax credit (as a percent) |  |  |  |  |  |  |  |  |  | (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign | (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Uncertain tax positions (as a percent) |  |  |  |  |  |  |  |  | 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies | (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies |
Impact of NeuCo's tax provision charges (as a percent) |  |  |  |  |  |  |  |  | 0.90%crai_EffectiveIncomeTaxRateReconciliationTaxProvisionChargesOfSubsidiary | 1.50%crai_EffectiveIncomeTaxRateReconciliationTaxProvisionChargesOfSubsidiary | 0.10%crai_EffectiveIncomeTaxRateReconciliationTaxProvisionChargesOfSubsidiary
Permanently disallowed expenses (as a percent) |  |  |  |  |  |  |  |  | 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense | 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense | 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Prior period adjustments (as a percent) |  |  |  |  |  |  |  |  | 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes |  |
Release of valuation allowance (as a percent) |  |  |  |  |  |  |  |  | (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance |  |
Other (as a percent) |  |  |  |  |  |  |  |  |  | (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments |
Effective tax rate (as a percent) |  |  |  |  |  |  |  |  | 42.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 37.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations | (8.90%)us-gaap_EffectiveIncomeTaxRateContinuingOperations

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