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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			$ 6,700,000us-gaap_RestructuringCharges
Restructuring charges related to termination benefits, facility related charges, asset write downs and other charges			5,400,000crai_RestructuringChargesRelatedToTerminationBenefitsFacilityRelatedChargesFixedAssetWriteDownsAndOtherCharges
Restructuring expenses and reserve balance
Balance at the beginning of the period	1,170,000us-gaap_RestructuringReserve	2,979,000us-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	42,000us-gaap_RestructuringReserveTranslationAndOtherAdjustment	(321,000)us-gaap_RestructuringReserveTranslationAndOtherAdjustment
Balance at the end of the period	462,000us-gaap_RestructuringReserve	1,170,000us-gaap_RestructuringReserve	2,979,000us-gaap_RestructuringReserve
Cost of sales
Restructuring charges disclosures
Restructuring expenses			3,800,000us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Selling, general and administrative expenses
Restructuring charges disclosures
Restructuring expenses			1,500,000us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Depreciation and amortization expense
Restructuring charges disclosures
Restructuring expenses			1,400,000us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = crai_DepreciationAndAmortizationExpenseMember
Office Vacancies
Restructuring expenses and reserve balance
Balance at the beginning of the period	1,170,000us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	2,106,000us-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	42,000us-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	462,000us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember	1,170,000us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Employee Workforce Reduction
Restructuring expenses and reserve balance
Balance at the beginning of the period		873,000us-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				1,700,000us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = crai_LondonOfficeSurrenderMember
Number of floors under lease surrendered			1crai_NumberOfFloorsUnderLeaseSurrendered / us-gaap_RestructuringPlanAxis = crai_LondonOfficeSurrenderMember
Number of floors under lease			3crai_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				500,000us-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			$ 400,000us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = crai_HoustonOfficeSpaceAdjustmentsMember
Restructuring Plan, July 2012 | Minimum
Restructuring charges disclosures
Number of consulting positions reduced under the plan			60us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RestructuringPlanAxis = crai_RestructuringPlanJuly2012Member

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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-Publisher FASB

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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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.

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