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Revenue Recognition - Unbilled Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Roll forward of the unbilled receivables allowance
Balance at beginning of period	$ 1,720	$ 2,354	$ 2,354
Increases to reserves	884		2,102
Amounts written off	(242)		(2,736)
Balance at end of period	2,362		$ 1,720
Reimbursable expenses	$ 9,140	$ 8,030

X

- Definition

Represents the valuation allowance for unbilled service receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

No definition available.

+ Details

Name:	crai_AllowanceForUnbilledServices
Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amounts of increase (decrease) as a result of the amount written off on allowance for unbilled services.

+ References

No definition available.

+ Details

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

X

- Definition

Amounts of increase (decrease) as a result of Increases to reserve on allowance for unbilled services.

+ References

No definition available.

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

X

- Definition

Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 45
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=51671805&loc=d3e60722-111653

+ Details

Name:	us-gaap_ReimbursementRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration