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Business Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015 segment	Dec. 28, 2013	Dec. 29, 2012
Business segment and geographic information
Number of business segments									1us-gaap_NumberOfReportableSegments
Revenues	$ 78,459us-gaap_SalesRevenueServicesNet	$ 73,483us-gaap_SalesRevenueServicesNet	$ 78,184us-gaap_SalesRevenueServicesNet	$ 76,245us-gaap_SalesRevenueServicesNet	$ 75,672us-gaap_SalesRevenueServicesNet	$ 74,427us-gaap_SalesRevenueServicesNet	$ 65,203us-gaap_SalesRevenueServicesNet	$ 63,130us-gaap_SalesRevenueServicesNet	$ 306,371us-gaap_SalesRevenueServicesNet	$ 278,432us-gaap_SalesRevenueServicesNet	$ 270,390us-gaap_SalesRevenueServicesNet
Long-lived assets (property and equipment, net)	14,696us-gaap_PropertyPlantAndEquipmentNet				15,655us-gaap_PropertyPlantAndEquipmentNet				14,696us-gaap_PropertyPlantAndEquipmentNet	15,655us-gaap_PropertyPlantAndEquipmentNet
United States
Business segment and geographic information
Revenues									238,466us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_US	216,815us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_US	207,779us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_US
Long-lived assets (property and equipment, net)	12,753us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US				13,657us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US				12,753us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US	13,657us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
United Kingdom
Business segment and geographic information
Revenues									49,127us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_GB	46,987us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_GB	51,059us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_GB
Long-lived assets (property and equipment, net)	1,595us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB				1,911us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB				1,595us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB	1,911us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB
Other
Business segment and geographic information
Revenues									18,778us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = crai_OtherForeignCountriesMember	14,630us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = crai_OtherForeignCountriesMember	11,552us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = crai_OtherForeignCountriesMember
Long-lived assets (property and equipment, net)	348us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = crai_OtherForeignCountriesMember				87us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = crai_OtherForeignCountriesMember				348us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = crai_OtherForeignCountriesMember	87us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = crai_OtherForeignCountriesMember
Total foreign
Business segment and geographic information
Revenues									67,905us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = crai_ForeignCountriesMember	61,617us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = crai_ForeignCountriesMember	62,611us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = crai_ForeignCountriesMember
Long-lived assets (property and equipment, net)	$ 1,943us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = crai_ForeignCountriesMember				$ 1,998us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = crai_ForeignCountriesMember				$ 1,943us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = crai_ForeignCountriesMember	$ 1,998us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = crai_ForeignCountriesMember

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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-Name Accounting Standards Codification

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-Section S99

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-Number 210

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Subparagraph (SX 210.5-03.1(d))

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