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Commitments and Contingencies (Details) $ in Millions	May 08, 2017 USD ($) ft²	Apr. 21, 2017 USD ($) ft²
New York, New York
Operating Lease Rent
Additional lease area | ft²		16,587
Lease area | ft²		25,261
Annual base rent		$ 1.2
Increase in annual base rent (as a percent)		8.00%
Number of years of annual base rent		5 years
Rent abatement		$ 1.2
Tenant improvement allowance		$ 1.4
Chicago, Illinois
Operating Lease Rent
Lease area | ft²	41,642
Annual base rent	$ 1.1
Increase in annual base rent (as a percent)	2.50%
Rent abatement	$ 0.9
Tenant improvement allowance	$ 2.3
Lease extension term	10 years

X

- Definition

Represents number of years of annual base rent applicable before increase in rent.

+ References

No definition available.

+ Details

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

X

- Definition

This element represents the annual base payments that the lessee is obligated to make in connection with a property under the terms of an agreement classified as an operating lease.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the percentage increase in annual base rent.

+ References

No definition available.

+ Details

Name:	crai_OperatingLeasePercentageIncreaseInAnnualBaseRent
Namespace Prefix:	crai_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the additional lease area to be taken by the entity.

+ References

No definition available.

+ Details

Name:	crai_OperatingLeasesAdditionalAreaTakenOnLease
Namespace Prefix:	crai_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the additional lease area to be taken by the entity.

+ References

No definition available.

+ Details

Name:	crai_OperatingLeasesAreaTakenOnLease
Namespace Prefix:	crai_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents abatement of rent.

+ References

No definition available.

+ Details

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

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForTenantImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementGeographicalAxis=crai_NewYorkNewYorkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=crai_ChicagoIllinoisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: