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Subsequent Event (Details) - Jul. 15, 2015 - Subsequent event. - IC-SIC Property | USD ($) ft² item
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Subsequent Event |
Area of office building taken on lease | ft² | 25,261
Initial term of the lease | 10 years
Number of options available for lease extensions | item | 1
Period for which lease tem can be extended | 5 years
Threshold amount of monthly fixed rent for the first five year of the lease's base term | $ 153,671
Threshold amount of annual fixed rent for the first five year of the lease's base term | 1,844,053
Incremental monthly fixed rent for remainder of the lease's base term | 166,301
Incremental annual fixed rent for remainder of the lease's base term | 1,955,619
Amount of letters of credit issued as security | $ 922,027

X
- Definition Represents the amount of letters of credit issued as security under the lease. + References No definition available. + Details
Name: | crai_OperatingLeaseAmountOfLetterOfCreditIssuedAsSecurity
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the threshold amount of annual fixed rent of real estate property taken on lease. + References No definition available. + Details
Name: | crai_OperatingLeaseAnnualFixedRentThresholdAmount
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the incremental amount of fixed annual rent of real estate property taken on lease + References No definition available. + Details
Name: | crai_OperatingLeaseIncrementalAnnualFixedRent
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the incremental amount of fixed monthly rent of real estate property taken on lease. + References No definition available. + Details
Name: | crai_OperatingLeaseIncrementalMonthlyFixedRent
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the initial period of real estate property taken on lease. + References No definition available. + Details
Name: | crai_OperatingLeaseInitialTerm
Namespace Prefix: | crai_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the threshold amount of annual fixed rent of real estate property taken on lease. + References No definition available. + Details
Name: | crai_OperatingLeaseMonthlyFixedRentThresholdAmount
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of options available to extend the lease term. + References No definition available. + Details
Name: | crai_OperatingLeaseNumberOfOptionsForLeaseExtension
Namespace Prefix: | crai_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for which lease term can be extended. + References No definition available. + Details
Name: | crai_OperatingLeasePeriodForWhichLeaseTermCanBeExtended
Namespace Prefix: | crai_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CounterpartyNameAxis=crai_ICSICPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |