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Forgivable Loans (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 02, 2016	Jan. 02, 2016
Forgivable loans activity
Beginning balance	$ 44,685	$ 45,356
Advances	5,280	14,531
Repayments	(539)
Amortization	(8,272)	(15,202)
Effect of foreign currency translation	(266)
Ending balance	40,888	44,685
Current portion of forgivable loans	8,421	4,402
Non-current portion of forgivable loans	$ 32,467	$ 40,283

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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 (decrease) 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

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

Amount of cash outflow for the 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