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Forgivable Loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 03, 2021	Jan. 02, 2021
Forgivable loan activity
Beginning balance	$ 61,613	$ 55,141
Advances	2,153	42,418
Reclassification from accrued expenses / to other assets	0	(9,713)
Amortization	(6,295)	(26,628)
Effects of foreign currency translation	88	395
Ending balance	57,559	61,613
Current portion of forgivable loans	13,196	14,749
Non-current portion of forgivable loans	$ 44,363	$ 46,864

X

- 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.

+ References

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 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