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Net Income per Share (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Oct. 23, 2014	Feb. 13, 2014	Aug. 10, 2012
Share Repurchase Program
Share repurchase program, amount authorized to be repurchased			$ 30.0us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 15.0us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 5.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
Number of shares repurchased and retired	144,900us-gaap_StockRepurchasedAndRetiredDuringPeriodShares	95,600us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Average repurchase price per share (in dollars per share)	$ 31.33crai_StockRepurchaseDuringPeriodAverageCostPerShare	$ 22.25crai_StockRepurchaseDuringPeriodAverageCostPerShare
Amount available for future repurchases	$ 16.4us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

X

- Details

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

X

- Definition

Represents the average price per share of the shares repurchased by the entity during the reporting period.

+ References

No definition available.

+ Details

Name:	crai_StockRepurchaseDuringPeriodAverageCostPerShare
Namespace Prefix:	crai_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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