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Forgivable Loans - Schedule of Forgivable Loan Activity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 29, 2025	Sep. 27, 2025	Sep. 28, 2024	Dec. 28, 2024
Forgivable loan activity
Beginning balance	$ 55,492	$ 55,492	$ 53,941
Advances	45,494	70,338
Repayments	(2,761)	(1,933)
Reclassifications from accrued expenses or to other assets	(9,989)	(333)
Amortization	(31,055)	(22,605)
Effects of foreign currency translation	$ (138)	387
Ending balance		101,346
Current portion of forgivable loans		20,881		$ 6,535
Non-current portion of forgivable loans		$ 80,465		$ 48,957

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- Definition

Forgivable Loan Activity

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No definition available.

+ Details

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

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- Definition

Represents information pertaining to forgivable loans provided as on the balance sheet date.

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No definition available.

+ Details

Name:	crai_ForgivableLoans
Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amounts of increase as a result of advances on loans forgivable.

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No definition available.

+ Details

Name:	crai_ForgivableLoansAdvances
Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Represents information pertaining to amortizations on forgivable loans during the period.

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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

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- Definition

Amounts due on long-term loans forgivable on the balance sheet date.

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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.

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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