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Forgivable Loans - Narrative (Details)	Mar. 30, 2024
Forgivable Loans [Line Items]
Forgivable loans, interest rate (up to)	0.0600
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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Namespace Prefix:	crai_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Forgivable Loans, Interest Rate

+ References

No definition available.

+ Details

Name:	crai_ForgivableLoansInterestRate
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

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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