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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) | 12 Months Ended
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Jan. 02, 2021 quarter unit
Goodwill |
Number of reporting units | unit | 1
Number of trailing quarters used to determine the control premium | quarter | 4
Minimum | Customer relationships |
Intangible Assets |
Estimated useful life (in years) | 8 years
Maximum | Non-competition agreements |
Intangible Assets |
Estimated useful life (in years) | 5 years
Maximum | Customer relationships |
Intangible Assets |
Estimated useful life (in years) | 10 years

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- References No definition available. + Details
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Namespace Prefix: | crai_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of trailing quarters used to determine the control premium utilizing data from publicly available premium studies. + References No definition available. + Details
Name: | crai_NumberOfTrailingQuartersToDetermineControlPremium
Namespace Prefix: | crai_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
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- Details
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- Details
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X
- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |