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Forgivable Loans - Narrative (Details) $ in Thousands	6 Months Ended
	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

X

- Definition

Forgivable Loan, Term

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Forgivable Loans, Accelerated Amortization

+ References

No definition available.

+ Details

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Namespace Prefix:	crai_
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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Namespace Prefix:	crai_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Forgivable Loans [Line Items]

+ References

No definition available.

+ Details

Name:	crai_ForgivableLoansLineItems
Namespace Prefix:	crai_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: