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

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