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Contingencies (Details) - CRA International (UK) Limited - Office Space Lease Guarantee in London £ in Millions	May 20, 2016 GBP (£) ft² item
Guarantor obligations
Number of lease agreements entered | item	2
Area of office space leased | ft²	22,990
Annual rent increment period	5 years
Aggregate amount plus VAT agreed to be paid by the landlord	£ 0.1
Ground floor office space
Guarantor obligations
Annual fixed rent	£ 0.2
Lease term	10 years
Fourth floor office space
Guarantor obligations
Annual fixed rent	£ 1.4

X

- Definition

The number of lease agreements entered into by the entity.

+ References

No definition available.

+ Details

Name:	crai_NumberOfLeaseAgreementsEntered
Namespace Prefix:	crai_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The aggregate amount plus VAT, agreed to be paid in connection with the building out of the leased properties.

+ References

No definition available.

+ Details

Name:	crai_OperatingLeaseAgreedAggregateAmountPlusValueAddedTax
Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The period by which the annual rent will be increased, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	crai_OperatingLeasesAnnualRentIncrementPeriod
Namespace Prefix:	crai_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the annual fixed rent.

+ References

No definition available.

+ Details

Name:	crai_OperatingLeasesRentExpenseAnnualFixedRent
Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_GuaranteeObligationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=crai_CraInternationalUkLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_PropertyLeaseGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=crai_GroundFloorSpaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=crai_FourthFloorSpaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: