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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)	12 Months Ended
	Dec. 28, 2024 reporting_unit quarter
Accounting Policies [Abstract]
Number of reporting units | reporting_unit	1
Number of trailing quarters used to determine the control premium | quarter	4

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

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_NumberOfReportingUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration