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Revenue Recognition (Details 2) $ in Thousands	3 Months Ended
	Apr. 02, 2016 USD ($)
A rollforward of the accounts receivable allowance
Balance at January 2, 2016	$ 3,648
Increases to reserve	836
Amounts written off	(503)
Effects of foreign currency translation	(4)
Balance at April 2, 2016	$ 3,977

X

- Definition

Amounts of increase (decrease) as a result of the amount written off on accounts receivable allowance.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the changes in accounts receivable from the effects of foreign currency translation.

+ References

No definition available.

+ Details

Name:	crai_AllowanceForDoubtfulAccountsReceivableEffectsOfForeignCurrencyTranslation
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 accounts receivable allowance.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant