XML 43 R32.htm IDEA: XBRL DOCUMENT
v3.19.1

Summary of Significant Accounting Policies - GNU Interest (Details) | Dec. 18, 2018
--- | ---
GNU |
GNU Interest |
Percentage of ownership interest held by the entity | 55.89%

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_OwnershipAxis=crai_Gnu123LiquidatingCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |