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Forgivable Loans - Summary of Forgivable Loan Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 29, 2024 | Dec. 28, 2024 | Dec. 30, 2023
Forgivable loan activity |  |  |
Beginning balance |  | $ 53,941 | $ 56,456
Advances |  | 45,494 | 23,342
Repayments |  | (2,761) | (1,816)
Reclassifications from accrued expenses or to other assets |  | (9,989) | 0
Amortization |  | (31,055) | (24,198)
Effects of foreign currency translation |  | (138) | 157
Ending balance |  | 55,492 | 53,941
Current portion of forgivable loans |  | 6,535 | 8,759
Non-current portion of forgivable loans |  | $ 48,957 | $ 45,182
Forgivable loans, accelerated amortization | $ 5,700 |  |

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- 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

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- 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

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- Definition Forgivable Loans, Accelerated Amortization + References No definition available. + Details
Name: | crai_ForgivableLoansAcceleratedAmortization
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- 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: | debit
Period Type: | duration

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- 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 to other assets. + References No definition available. + Details
Name: | crai_ForgivableLoansReclassificationToOtherAssets
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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