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Prepaid Expenses and Other Current Assets, and Other Assets (Details) (USD $)
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Prepaid expenses and other current assets    
Term loans to employees $ 1,564,000us-gaap_DueFromEmployeesCurrent $ 1,764,000us-gaap_DueFromEmployeesCurrent
Other 11,601,000us-gaap_OtherPrepaidExpenseCurrent 10,011,000us-gaap_OtherPrepaidExpenseCurrent
Total 13,165,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 11,775,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Other assets    
Forgivable loans to employees and non-employee experts 42,907,000crai_ForgivableLoansAndTermLoansToEmployeesAndNonEmployeeExpertsNoncurrent 51,083,000crai_ForgivableLoansAndTermLoansToEmployeesAndNonEmployeeExpertsNoncurrent
Other 5,008,000us-gaap_OtherAssetsMiscellaneousNoncurrent 3,538,000us-gaap_OtherAssetsMiscellaneousNoncurrent
Total 47,915,000us-gaap_OtherAssetsNoncurrent 54,621,000us-gaap_OtherAssetsNoncurrent
Prepaid expenses and other assets disclosures    
Term of forgivable loans or advances to employees and non-employee experts, minimum 3 years  
Term of forgivable loans or advances to employees and non-employee experts, maximum 8 years  
Forgivable loans issued to future employees for future service $ 10,900,000crai_ForgivableLoansAdvancesToEmployeesAndNonEmployee $ 38,800,000crai_ForgivableLoansAdvancesToEmployeesAndNonEmployee