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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 |  |  | $ 30.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 15.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 5.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Number of shares repurchased and retired | 144,900 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 95,600 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  |
Average repurchase price per share (in dollars per share) | $ 31.33 crai_StockRepurchaseDuringPeriodAverageCostPerShare | $ 22.25 crai_StockRepurchaseDuringPeriodAverageCostPerShare |  |  |
Amount available for future repurchases | $ 16.4 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |  |

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

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- 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

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- 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

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- 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

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant