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Forgivable Loans (Details) $ in Thousands	12 Months Ended
	Jan. 02, 2021 USD ($) loan	Dec. 28, 2019 USD ($) loan	Dec. 29, 2018 USD ($) loan
Forgivable Loans [Line Items]
Number of loan balances which full principal and interest were not forgiven | loan	0	0	0
Forgivable loan activity
Beginning balance	$ 55,141	$ 40,294
Advances	42,418	35,166
Repayments	0	(1,173)
Reclassification to other assets	(9,713)	(1,734)
Amortization	(26,628)	(17,700)
Effects of foreign currency translation	395	288
Ending balance	61,613	55,141	$ 40,294
Current portion of forgivable loans	14,749	6,751
Non-current portion of forgivable loans	$ 46,864	$ 48,390
Minimum
Forgivable Loans [Line Items]
Term of forgivable loans or advances (in years)	1 year
Maximum
Forgivable Loans [Line Items]
Term of forgivable loans or advances (in years)	8 years
Interest rates (as a percent)	0.0283

X

- Definition

Forgivable Loan Activity

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No definition available.

+ Details

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- Definition

Represents the term of forgivable loans or advances issuable to employees and non-employee experts.

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No definition available.

+ Details

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Namespace Prefix:	crai_
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X

- Definition

Represents information pertaining to forgivable loans provided as on the balance sheet date.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amounts of increase as a result of advances on loans forgivable.

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No definition available.

+ Details

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Namespace Prefix:	crai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Represents information pertaining to amortizations on forgivable loans during the period.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The current portion of forgivable loans to employees and non employee experts on the balance sheet date.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents information pertaining to interest rates charged on outstanding forgivable loans.

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No definition available.

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Data Type:	xbrli:pureItemType
Balance Type:	na
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X

- Definition

Forgivable Loans

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No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amounts due on long-term loans forgivable on the balance sheet date.

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No definition available.

+ Details

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Balance Type:	debit
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- Definition

Forgivable Loans, Number of Loan Balances which Full Principal and Interest were not Forgiven

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No definition available.

+ Details

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- Definition

Amounts of decrease as a result of reclassification to other assets.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Amounts of decrease as a result of repayment of forgivable loan.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Amounts of increase (decrease) as a result of foreign currency translation on loans forgivable.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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