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Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Operating activities:
Net income	$ 2,899us-gaap_ProfitLoss	$ 3,308us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash used in operating activities, net of effect of acquired businesses:
Depreciation and amortization	1,679us-gaap_DepreciationDepletionAndAmortization	1,597us-gaap_DepreciationDepletionAndAmortization
Loss on disposal of property and equipment	(16)us-gaap_GainLossOnDispositionOfAssets
Deferred rent	344us-gaap_StraightLineRent	(687)us-gaap_StraightLineRent
Deferred income taxes	48us-gaap_DeferredIncomeTaxExpenseBenefit	47us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation expenses	1,609us-gaap_ShareBasedCompensation	1,327us-gaap_ShareBasedCompensation
Excess tax benefits on share-based compensation	(39)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Gain on extinguishment of debt	606us-gaap_GainsLossesOnExtinguishmentOfDebt
Accounts receivable allowances	1,086crai_IncreaseDecreaseInAllowanceForDoubtfulAccountsReceivable	(722)crai_IncreaseDecreaseInAllowanceForDoubtfulAccountsReceivable
Changes in operating assets and liabilities, exclusive of acquisitions:
Accounts receivable	245us-gaap_IncreaseDecreaseInAccountsReceivable	2,910us-gaap_IncreaseDecreaseInAccountsReceivable
Unbilled services	(7,557)us-gaap_IncreaseDecreaseInUnbilledReceivables	(5,003)us-gaap_IncreaseDecreaseInUnbilledReceivables
Prepaid expenses and other current assets, and other assets	(984)crai_IncreaseDecreaseInPrepaidExpensesAndOtherAssets	123crai_IncreaseDecreaseInPrepaidExpensesAndOtherAssets
Accounts payable, accrued expenses, and other liabilities	(22,942)us-gaap_IncreaseDecreaseInOperatingLiabilities	(17,357)us-gaap_IncreaseDecreaseInOperatingLiabilities
Net cash used in operating activities	(24,202)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	(14,457)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities:
Consideration relating to acquisitions, net		(1,504)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Purchase of property and equipment	(2,364)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(447)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Collections on notes receivable	1,550us-gaap_ProceedsFromSaleAndCollectionOfNotesReceivable
Payments on notes receivable	(40)us-gaap_PaymentsToAcquireNotesReceivable
Net cash used in investing activities	(854)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(1,951)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities:
Payments on notes payable	(300)us-gaap_RepaymentsOfNotesPayable	(16)us-gaap_RepaymentsOfNotesPayable
Tax withholding payment reimbursed by restricted shares	(66)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation	(143)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Excess tax benefits on share-based compensation	39us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Repurchase of common stock	(4,535)us-gaap_PaymentsForRepurchaseOfCommonStock	(2,124)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities	(4,862)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	(2,283)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of foreign exchange rates on cash and cash equivalents	(1,051)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	(68)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Net decrease in cash and cash equivalents	(30,969)us-gaap_NetCashProvidedByUsedInContinuingOperations	(18,759)us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at beginning of period	48,199us-gaap_CashAndCashEquivalentsAtCarryingValue	51,251us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period	17,230us-gaap_CashAndCashEquivalentsAtCarryingValue	32,492us-gaap_CashAndCashEquivalentsAtCarryingValue
Noncash investing and financing activities:
Issuance of common stock for acquired business		427crai_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationAmount
Supplemental cash flow information:
Cash paid for income taxes	168us-gaap_IncomeTaxesPaidNet	3,525us-gaap_IncomeTaxesPaidNet
Cash paid for interest	$ 78us-gaap_InterestPaid	$ 96us-gaap_InterestPaid

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