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Common Stock (Details) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012	Oct. 23, 2014	Feb. 13, 2014	Aug. 10, 2012
Share-Based Compensation
Share-based compensation expense	$ 5,300,000us-gaap_AllocatedShareBasedCompensationExpense	$ 2,900,000us-gaap_AllocatedShareBasedCompensationExpense	$ 4,900,000us-gaap_AllocatedShareBasedCompensationExpense
Non-employee compensation expense	271,000us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims	147,000us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims	79,000us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Employee tax withholdings paid on redemption of vested restricted shares	1,222,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	730,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1,360,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Common Stock Repurchases and Retirements
Share repurchase program, amount authorized to be repurchased				30,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1	15,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1	5,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Number of shares repurchased and retired	971,515us-gaap_StockRepurchasedAndRetiredDuringPeriodShares	118,968us-gaap_StockRepurchasedAndRetiredDuringPeriodShares	466,109us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Aggregate price of shares repurchased and retired	25,492,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue	2,190,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue	9,062,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Amount available for future repurchases	20,900,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Restricted shares
Share-Based Compensation
Vested (in shares)	149,195us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = crai_RestrictedStockAndRestrictedStockUnitAwardsMember	134,384us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = crai_RestrictedStockAndRestrictedStockUnitAwardsMember	216,528us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = crai_RestrictedStockAndRestrictedStockUnitAwardsMember
Redemption of vested restricted shares in order to pay employee tax withholdings (in shares)	41,470us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = crai_RestrictedStockAndRestrictedStockUnitAwardsMember	37,642us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = crai_RestrictedStockAndRestrictedStockUnitAwardsMember	69,207us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = crai_RestrictedStockAndRestrictedStockUnitAwardsMember
Employee tax withholdings paid on redemption of vested restricted shares	1,200,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = crai_RestrictedStockAndRestrictedStockUnitAwardsMember	700,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = crai_RestrictedStockAndRestrictedStockUnitAwardsMember	1,400,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = crai_RestrictedStockAndRestrictedStockUnitAwardsMember
Employees and directors
Share-Based Compensation
Share-based compensation expense	$ 5,300,000us-gaap_AllocatedShareBasedCompensationExpense / crai_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfShareRecipientAxis = crai_EmployeesAndDirectorsMember	$ 2,900,000us-gaap_AllocatedShareBasedCompensationExpense / crai_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfShareRecipientAxis = crai_EmployeesAndDirectorsMember	$ 4,900,000us-gaap_AllocatedShareBasedCompensationExpense / crai_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfShareRecipientAxis = crai_EmployeesAndDirectorsMember

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims.

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-Publisher FASB

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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