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Revenue Recognition - General (Details) | Dec. 28, 2019 item
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Revenue Recognition |
Number of broad lines of consulting services | 2

X
- Definition Number of broad areas in consulting services offered by the reporting entity. + References No definition available. + Details
Name: | crai_NumberOfBroadAreasOfConsultingServices
Namespace Prefix: | crai_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration