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Forgivable Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022	Dec. 31, 2022
Forgivable loan activity
Beginning balance	$ 56,456	$ 48,591
Advances	16,842	34,984
Repayments	(616)	(25)
Reclassifications from accrued expenses or to other assets	0	(2,192)
Amortization	(6,242)	(24,403)
Effects of foreign currency translation	80	$ (499)
Ending balance	66,520
Current portion of forgivable loans	13,781		$ 9,666
Non-current portion of forgivable loans	$ 52,739		$ 46,790

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- 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 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

- 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

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- Definition

The current portion of forgivable loans to employees and non employee experts on the balance sheet date.

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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