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v3.22.4

Forgivable Loans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) loan | Jan. 01, 2022 USD ($) loan | Jan. 02, 2021 USD ($) loan
Forgivable Loans [Line Items] |  |  |
Number of loan balances which full principal and interest were not forgiven | loan | 0 | 0 | 0
Forgivable loan activity |  |  |
Beginning balance | $ 48,591 | $ 61,613 |
Advances | 34,984 | 14,528 |
Repayments | (25) | (69) |
Reclassifications from accrued expenses or to other assets | (2,192) | (2,229) |
Amortization | (24,403) | (25,187) |
Effects of foreign currency translation | (499) | (65) |
Ending balance | 56,456 | 48,591 | $ 61,613
Current portion of forgivable loans | 9,666 | 10,571 |
Non-current portion of forgivable loans | $ 46,790 | $ 38,020 |
Minimum |  |  |
Forgivable Loans [Line Items] |  |  |
Term of forgivable loans or advances (in years) | 2 years |  |
Maximum |  |  |
Forgivable Loans [Line Items] |  |  |
Term of forgivable loans or advances (in years) | 6 years |  |
Interest rates (as a percent) | 0.0427 |  |

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 the term of forgivable loans or advances issuable to employees and non-employee experts. + References No definition available. + Details
Name: | crai_ForgivableLoanAdvancesTermToEmployeesAndNonEmployeeExperts
Namespace Prefix: | crai_
Data Type: | xbrli:durationItemType
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 Represents information pertaining to interest rates charged on outstanding forgivable loans. + References No definition available. + Details
Name: | crai_ForgivableLoansInterestRate
Namespace Prefix: | crai_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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

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 Forgivable Loans, Number of Loan Balances which Full Principal and Interest were not Forgiven + References No definition available. + Details
Name: | crai_ForgivableLoansNumberOfLoanBalancesWhichFullPrincipalAndInterestWereNotForgiven
Namespace Prefix: | crai_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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

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

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
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Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |