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v3.20.4

Forgivable Loans (Details) $ in Thousands | 12 Months Ended
--- | ---
Jan. 02, 2021 USD ($) loan | Dec. 28, 2019 USD ($) loan | Dec. 29, 2018 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 | $ 55,141 | $ 40,294 |
Advances | 42,418 | 35,166 |
Repayments | 0 | (1,173) |
Reclassification to other assets | (9,713) | (1,734) |
Amortization | (26,628) | (17,700) |
Effects of foreign currency translation | 395 | 288 |
Ending balance | 61,613 | 55,141 | $ 40,294
Current portion of forgivable loans | 14,749 | 6,751 |
Non-current portion of forgivable loans | $ 46,864 | $ 48,390 |
Minimum |  |  |
Forgivable Loans [Line Items] |  |  |
Term of forgivable loans or advances (in years) | 1 year |  |
Maximum |  |  |
Forgivable Loans [Line Items] |  |  |
Term of forgivable loans or advances (in years) | 8 years |  |
Interest rates (as a percent) | 0.0283 |  |

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
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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