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Forgivable Loans - Narrative (Details) $ in Thousands | 6 Months Ended
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Jun. 29, 2024 USD ($)
Forgivable Loans [Line Items] |
Forgivable loans, interest rate (up to) | 0.0500
Forgivable loans, accelerated amortization | $ (5,700)
Minimum |
Forgivable Loans [Line Items] |
Forgivable loan, term | 2 years
Maximum |
Forgivable Loans [Line Items] |
Forgivable loan, term | 6 years

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- Definition Forgivable Loan, Term + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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

X
- Definition Forgivable Loans, Interest Rate + References No definition available. + Details
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Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Forgivable Loans [Line Items] + References No definition available. + Details
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Namespace Prefix: | crai_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |