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Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Revenue from Contract with Customer [Abstract]
Bad debt expense (recovery), net	$ (121)	$ (13)
Reimbursable expenses	$ 16,204	$ 16,479

X

- Definition

It represents information about bad debt recovery (recovery).

+ References

No definition available.

+ Details

Name:	crai_BadDebtExpenseRecovery
Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of reimbursable expenses, which include expenses for travel and other out-of-pocket expenses, outside consultants, and other reimbursable expenses. Revenues include reimbursable expenses.

+ References

No definition available.

+ Details

Name:	crai_ReimbursableExpensesSubjectToReimbursement
Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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