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Description of Business (Details) | 6 Months Ended
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Jul. 04, 2015 item
Description of Business |
Number of broad areas of services | 2
Number of business segments | 1

X
- References No definition available. + Details
Name: | crai_DescriptionOfBusinessDisclosureAbstract
Namespace Prefix: | crai_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the area of services broadly offered by the entity. + References No definition available. + Details
Name: | crai_NumberOfAreasOfServices
Namespace Prefix: | crai_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration