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Forgivable Loans (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2020 | Dec. 28, 2019
Forgivable Loans |  |
Allowances for forgivable loans | $ 0 | $ 0
Amount of forgivable loans written-off | 0 | 0
Forgivable loan activity |  |
Beginning balance | 55,141,000 | 40,294,000
Advances | 38,478,000 | 35,166,000
Repayments | 0 | (1,173,000)
Reclassification from accrued expenses / to other assets | (9,713,000) | (1,734,000)
Amortization | (19,517,000) | (17,700,000)
Effects of foreign currency translation | (214,000) | 288,000
Ending balance | 64,175,000 | 55,141,000
Current portion of forgivable loans | 6,037,000 | 6,751,000
Non-current portion of forgivable loans | $ 58,138,000 | $ 48,390,000

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 amount of expense related to write-down or write-off of forgivable loans to the amount expected to be collected. + References No definition available. + Details
Name: | crai_ForgivableLoanWriteDown
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
- References No definition available. + Details
Name: | crai_ForgivableLoansAbstract
Namespace Prefix: | crai_
Data Type: | xbrli:stringItemType
Balance Type: | na
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

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 Amount of expense (reversal of expense) for expected credit loss on forgivable loans. + References No definition available. + Details
Name: | crai_ForgivableLoansCreditLossExpenseReversal
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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