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v2.4.1.9

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

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