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Forgivable Loans (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 01, 2022 | Jan. 01, 2022
Forgivable loan activity |  |
Beginning balance | $ 48,591 | $ 61,613
Advances | 25,467 | 14,528
Repayments | (25) | (69)
Reclassifications from accrued expenses or to other assets | (1,411) | (2,229)
Amortization | (18,145) | (25,187)
Effects of foreign currency translation | (734) | (65)
Ending balance | 53,743 | 48,591
Current portion of forgivable loans | 10,453 | 10,571
Non-current portion of forgivable loans | $ 43,290 | $ 38,020

X
- Definition Forgivable Loan Activity + References No definition available. + Details
Name: | crai_ForgivableLoanActivityRollForward
Namespace Prefix: | crai_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents information pertaining to forgivable loans provided as on the balance sheet date. + References No definition available. + Details
Name: | crai_ForgivableLoans
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amounts of increase as a result of advances on loans forgivable. + References No definition available. + Details
Name: | crai_ForgivableLoansAdvances
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents information pertaining to amortizations on forgivable loans during the period. + References No definition available. + Details
Name: | crai_ForgivableLoansAmortization
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The current portion of forgivable loans to employees and non employee experts on the balance sheet date. + References No definition available. + Details
Name: | crai_ForgivableLoansCurrent
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amounts due on long-term loans forgivable on the balance sheet date. + References No definition available. + Details
Name: | crai_ForgivableLoansNoncurrent
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amounts of decrease as a result of reclassification from accrued expenses and reclassification to other assets. + References No definition available. + Details
Name: | crai_ForgivableLoansReclassificationFromAccruedExpensesToOtherAssets
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amounts of decrease as a result of repayment of forgivable loan. + References No definition available. + Details
Name: | crai_ForgivableLoansRepayments
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amounts of increase (decrease) as a result of foreign currency translation on loans forgivable. + References No definition available. + Details
Name: | crai_ForgivableLoansTranslationAdjustments
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration