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Subsequent Events (Details) - Subsequent events $ / shares in Units, $ in Millions | Feb. 16, 2017 $ / shares | Feb. 15, 2017 USD ($) ft² | Jan. 30, 2017 employee
--- | --- | --- | ---
Subsequent Event |  |  |
Common share quarterly cash dividend declared (in dollars per share) | $ / shares | $ 0.14 |  |
Toronto, Ontario, Canada |  |  |
Subsequent Event |  |  |
Lease area | ft² |  | 5,578 |
Increase in annual base rent (as a percent) |  | 2.00% |
Annual base rent | $ |  | $ 0.1 |
C1 Consulting LLC |  |  |
Subsequent Event |  |  |
New employees added upon acquisition | employee |  |  | 86

X
- Definition Number of new employees welcomed upon acquisitions. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the annual base payments that the lessee is obligated to make in connection with a property under the terms of an agreement classified as an operating lease. + References No definition available. + Details
Name: | crai_OperatingLeaseAnnualBaseRent
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the percentage increase in annual base rent. + References No definition available. + Details
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Namespace Prefix: | crai_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the additional lease area to be taken by the entity. + References No definition available. + Details
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Namespace Prefix: | crai_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |