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Subsequent Events (Details) $ / shares in Units, $ in Millions	May 08, 2017 USD ($) ft²	May 03, 2017 USD ($) $ / shares	Apr. 21, 2017 USD ($) ft²	Apr. 01, 2017 USD ($)	Mar. 21, 2016 USD ($)
Subsequent Events
Amount of stock authorized to repurchase					$ 20.0
Total available authorization for share repurchases				$ 9.0
Subsequent Events
Subsequent Events
Common stock quarterly cash dividend declared (in dollars per share) | $ / shares		$ 0.14
Amount of stock authorized to repurchase		$ 20.0
Total available authorization for share repurchases		$ 29.0
Subsequent Events | New York, New York
Subsequent Events
Area of office space leased | ft²			16,587
Annual base rent			$ 1.2
Increase of base rent after five years (as a percent)			8.00%
Base rent abatement			$ 1.2
Tenant improvement allowance			$ 1.4
Subsequent Events | Chicago, Illinois
Subsequent Events
Area of office space leased | ft²	41,642
Lease extension term	10 years
Annual base rent	$ 1.1
Annual increases in base rent (as a percent)	2.50%
Base rent abatement	$ 0.9
Tenant improvement allowance	$ 2.3

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

The amount of base rent abatement under the terms of an agreement classified as an operating lease.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage increase in the base rent in the fifth fiscal year following the lease agreement effective date.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage increase annually in the base rent following the lease agreement effective date.

+ References

No definition available.

+ Details

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

X

- Definition

Allowance granted by the landlord to a tenant to entice tenant to move into landlords building which will enable the tenant to prepare the leased premises for tenants occupancy.

+ References

No definition available.

+ Details

Name:	crai_TenantImprovementAllowance
Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of the lessee's leasing arrangement renewal, 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_LesseeLeasingArrangementsOperatingLeasesRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type: