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Prepaid Expenses and Other Current Assets, and Other Assets (Details) (USD $)
 3 Months Ended
Apr. 04, 2015
Jan. 03, 2015
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 $ 5,400,000crai_ForgivableLoansAdvancesToEmployeesAndNonEmployee  
Other assets    
Forgivable loans to employees and non-employee experts 44,017,000crai_ForgivableLoansAndTermLoansToEmployeesAndNonEmployeeExpertsNoncurrent 42,907,000crai_ForgivableLoansAndTermLoansToEmployeesAndNonEmployeeExpertsNoncurrent
Other 4,934,000us-gaap_OtherAssetsMiscellaneousNoncurrent 5,008,000us-gaap_OtherAssetsMiscellaneousNoncurrent
Total $ 48,951,000us-gaap_OtherAssetsNoncurrent $ 47,915,000us-gaap_OtherAssetsNoncurrent