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Forgivable Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 29, 2018	Dec. 30, 2017
Forgivable loan activity
Beginning balance	$ 28,628	$ 33,962
Advances	29,353	11,672
Repayments	(3,399)	(2,135)
Reclassification to other assets		(1,100)
Amortization	(11,308)	(14,155)
Effects of foreign currency translation	(88)	384
Ending balance	43,186	28,628
Current portion of forgivable loans	6,400	5,540
Non-current portion of forgivable loans	$ 36,786	$ 23,088

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- 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

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- References

No definition available.

+ Details

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

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- 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

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- 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

Amounts due on short-term loans forgivable 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

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- 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 to other assets.

+ References

No definition available.

+ Details

Name:	crai_ForgivableLoansReclassificationToOtherAssets
Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- 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