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Credit Agreement (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 28, 2014
Revolving credit facility |
Senior Loan Agreement |
Revolving credit facility, maximum capacity | $ 125.0
Amount outstanding under revolving line of credit | 0
Amounts outstanding under letters of credit | 1.4
Percentage of stock of domestic subsidiaries pledged as collateral for borrowings | 100.00%
Percentage of stock of foreign subsidiaries pledged as collateral for borrowings | 65.00%
Value of stock in net assets pledged as collateral for borrowings | 7.0
Ratio of consolidated interest expense to consolidated EBITDA | 2.5
Ratio of consolidated debt to consolidated EBITDA | 3.0
Revolving credit facility | Minimum |
Senior Loan Agreement |
Commitment fee payable on the unused portion of the credit facility (as a percent) | 0.25%
Revolving credit facility | Maximum |
Senior Loan Agreement |
Commitment fee payable on the unused portion of the credit facility (as a percent) | 0.375%
Revolving credit facility | Base rate |
Senior Loan Agreement |
Variable rate basis | base rate
Revolving credit facility | Base rate | Minimum |
Senior Loan Agreement |
Interest margin (as a percent) | 0.50%
Revolving credit facility | Base rate | Maximum |
Senior Loan Agreement |
Interest margin (as a percent) | 1.50%
Revolving credit facility | Eurocurrency rate |
Senior Loan Agreement |
Variable rate basis | eurocurrency rate
Revolving credit facility | Eurocurrency rate | Minimum |
Senior Loan Agreement |
Interest margin (as a percent) | 1.50%
Revolving credit facility | Eurocurrency rate | Maximum |
Senior Loan Agreement |
Interest margin (as a percent) | 2.50%
Letters of credit |
Senior Loan Agreement |
Revolving credit facility, maximum capacity | $ 15.0

X
- Definition Represents the value of the (consolidated adjusted earning before interest, taxes, depreciation and amortization, as defined) in the Consolidated Interest Coverage Ratio required by the covenants of the entity's senior credit facilities. + References No definition available. + Details
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Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the ratio of consolidated debt to consolidated EBITDA (earnings before interest, taxes, depreciation and amortization) ratio permitted under financial covenants. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of the stock of the entity's domestic subsidiaries pledged as collateral for the credit agreement. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of the stock of the entity's foreign subsidiaries pledged as collateral for the credit agreement. + References No definition available. + Details
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Data Type: | num:percentItemType
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Period Type: | instant

X
- Definition Represents the value of stock in net assets which is pledged as collateral for the credit agreement. + References No definition available. + Details
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Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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X
- Details
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Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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