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Restructuring Charges (Details) (USD $) | 12 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012 | Jun. 30, 2012
Restructuring charges disclosures |  |  |  |
Restructuring expenses |  |  | $ 6,700,000 us-gaap_RestructuringCharges |
Restructuring charges related to termination benefits, facility related charges, asset write downs and other charges |  |  | 5,400,000 crai_RestructuringChargesRelatedToTerminationBenefitsFacilityRelatedChargesFixedAssetWriteDownsAndOtherCharges |
Restructuring expenses and reserve balance |  |  |  |
Balance at the beginning of the period | 1,170,000 us-gaap_RestructuringReserve | 2,979,000 us-gaap_RestructuringReserve |  |
Amounts paid, net of amounts received | (750,000)us-gaap_PaymentsForRestructuring | (1,488,000)us-gaap_PaymentsForRestructuring |  |
Non-cash adjustments and effect of foreign currency translation | 42,000 us-gaap_RestructuringReserveTranslationAndOtherAdjustment | (321,000)us-gaap_RestructuringReserveTranslationAndOtherAdjustment |  |
Balance at the end of the period | 462,000 us-gaap_RestructuringReserve | 1,170,000 us-gaap_RestructuringReserve | 2,979,000 us-gaap_RestructuringReserve |
Cost of sales |  |  |  |
Restructuring charges disclosures |  |  |  |
Restructuring expenses |  |  | 3,800,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |
Selling, general and administrative expenses |  |  |  |
Restructuring charges disclosures |  |  |  |
Restructuring expenses |  |  | 1,500,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |
Depreciation and amortization expense |  |  |  |
Restructuring charges disclosures |  |  |  |
Restructuring expenses |  |  | 1,400,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = crai_DepreciationAndAmortizationExpenseMember |
Office Vacancies |  |  |  |
Restructuring expenses and reserve balance |  |  |  |
Balance at the beginning of the period | 1,170,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 2,106,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |
Amounts paid, net of amounts received | (750,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | (759,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |
Non-cash adjustments and effect of foreign currency translation | 42,000 us-gaap_RestructuringReserveTranslationAndOtherAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | (177,000)us-gaap_RestructuringReserveTranslationAndOtherAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |
Balance at the end of the period | 462,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 1,170,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |
Employee Workforce Reduction |  |  |  |
Restructuring expenses and reserve balance |  |  |  |
Balance at the beginning of the period |  | 873,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |
Amounts paid, net of amounts received |  | (729,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |
Non-cash adjustments and effect of foreign currency translation |  | (144,000)us-gaap_RestructuringReserveTranslationAndOtherAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |
London office surrender |  |  |  |
Restructuring charges disclosures |  |  |  |
Restructuring expenses |  |  |  | 1,700,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = crai_LondonOfficeSurrenderMember
Number of floors under lease surrendered |  |  | 1 crai_NumberOfFloorsUnderLeaseSurrendered / us-gaap_RestructuringPlanAxis = crai_LondonOfficeSurrenderMember |
Number of floors under lease |  |  | 3 crai_NumberOfFloorsUnderLease / us-gaap_RestructuringPlanAxis = crai_LondonOfficeSurrenderMember |
London office surrender | Lease surrender |  |  |  |
Restructuring expenses and reserve balance |  |  |  |
Amounts paid, net of amounts received |  |  |  | (1,200,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = crai_LondonOfficeSurrenderMember
London office surrender | Other restructuring |  |  |  |
Restructuring charges disclosures |  |  |  |
Restructuring expenses |  |  |  | 500,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = crai_LondonOfficeSurrenderMember
Houston office space adjustments |  |  |  |
Restructuring charges disclosures |  |  |  |
Pre-tax restructuring credit related to adjustments of leased office space in Houston, TX |  |  | $ 400,000 us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = crai_HoustonOfficeSpaceAdjustmentsMember |
Restructuring Plan, July 2012 | Minimum |  |  |  |
Restructuring charges disclosures |  |  |  |
Number of consulting positions reduced under the plan |  |  | 60 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RestructuringPlanAxis = crai_RestructuringPlanJuly2012Member |

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- Definition The amount of change in the restructuring reserve related to foreign currency translation adjustments and any other adjustments not separately disclosed or provided for elsewhere in the Taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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