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v3.6.0.2

Forgivable Loans (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) | Jan. 02, 2016 USD ($)
Interest rate (as a percent) | 0.0325 |
Amount of forgivable loan write-down or write-off | $ 0 | $ 0
Forgivable loans activity |  |
Beginning Balance | 44,685 | 45,356
Advances | 6,949 | 14,531
Accruals | (316) |
Repayments | (709) |
Amortization | (16,575) | (15,202)
Effect of foreign currency translation | (704) |
Ending Balance | 33,962 | 44,685
Current portion of forgivable loans | 5,897 | 4,402
Non-current portion of forgivable loans | $ 28,065 | $ 40,283
Minimum |  |
Term of forgivable loans or advances | 3 years |
Maximum |  |
Term of forgivable loans or advances | 8 years |

X
- Definition Represents the term of forgivable loans or advances issuable to employees and non-employee experts. + References No definition available. + Details
Name: | crai_ForgivableLoanAdvancesTermToEmployeesAndNonEmployeeExperts
Namespace Prefix: | crai_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of expense related to write-down or write-off of forgivable loans to the amount expected to be collected. + References No definition available. + Details
Name: | crai_ForgivableLoanWriteDown
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Balance Type: | debit
Period Type: | duration

X
- Definition Represents information pertaining to forgivable loans provided as on the balance sheet date. + References No definition available. + Details
Name: | crai_ForgivableLoans
Namespace Prefix: | crai_
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Balance Type: | debit
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- Definition Represents information pertaining to accruals of forgivable loans during the period. + References No definition available. + Details
Name: | crai_ForgivableLoansAccruals
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
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- Definition Represents the amount of forgivable loans or advances to employees and non-employee experts for future service. + References No definition available. + Details
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Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents information pertaining to amortizations on forgivable loans during the period. + References No definition available. + Details
Name: | crai_ForgivableLoansAmortization
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amounts due on short-term loans forgivable on the balance sheet date. + References No definition available. + Details
Name: | crai_ForgivableLoansCurrent
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents information pertaining to interest rates charged on outstanding forgivable loans. + References No definition available. + Details
Name: | crai_ForgivableLoansInterestRate
Namespace Prefix: | crai_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Amounts due on long-term loans forgivable on the balance sheet date. + References No definition available. + Details
Name: | crai_ForgivableLoansNoncurrent
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of cash outflow for the repayment of forgivable loan. + References No definition available. + Details
Name: | crai_ForgivableLoansRepayments
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amounts of increase (decrease) as a result of foreign currency translation on loans forgivable. + References No definition available. + Details
Name: | crai_ForgivableLoansTranslationAdjustments
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |