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Subsequent Events (Details) - Subsequent events $ / shares in Units, $ in Millions	Feb. 16, 2017 $ / shares	Feb. 15, 2017 USD ($) ft²	Jan. 30, 2017 employee
Subsequent Event
Common share quarterly cash dividend declared (in dollars per share) | $ / shares	$ 0.14
Toronto, Ontario, Canada
Subsequent Event
Lease area | ft²		5,578
Increase in annual base rent (as a percent)		2.00%
Annual base rent | $		$ 0.1
C1 Consulting LLC
Subsequent Event
New employees added upon acquisition | employee			86

X

- Definition

Number of new employees welcomed upon acquisitions.

+ References

No definition available.

+ Details

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Namespace Prefix:	crai_
Data Type:	xbrli:integerItemType
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

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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_OperatingLeasesAreaTakenOnLease
Namespace Prefix:	crai_
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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Balance Type:	na
Period Type:	duration

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

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Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=crai_TorontoOntarioCanadaMember
Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=crai_C1ConsultingLlcMember
Namespace Prefix:
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Balance Type:
Period Type: