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v3.22.1

Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 02, 2022 | Apr. 03, 2021
Revenue from Contract with Customer [Abstract] |  |
Bad debt expense (recovery), net | $ (121) | $ (13)
Reimbursable expenses | $ 16,204 | $ 16,479

X
- Definition It represents information about bad debt recovery (recovery). + References No definition available. + Details
Name: | crai_BadDebtExpenseRecovery
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of reimbursable expenses, which include expenses for travel and other out-of-pocket expenses, outside consultants, and other reimbursable expenses. Revenues include reimbursable expenses. + References No definition available. + Details
Name: | crai_ReimbursableExpensesSubjectToReimbursement
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration