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Business Acquisition (Details)	Jan. 31, 2013 person
Business Acquisition
Number of litigation consulting team members who joined the entity	40crai_NumberOfLitigationConsultingTeam

X

- Definition

Represents the number of litigation consulting team members who joined the entity.

+ References

No definition available.

+ Details

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

X

- Details

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