XML 23 R31.htm IDEA: XBRL DOCUMENT
v2.4.0.8

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

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