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

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- 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

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