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Summary of Significant Accounting Policies - GNU Interest (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 13, 2016
Jan. 08, 2015
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Jan. 02, 2016
Oct. 03, 2015
Jul. 04, 2015
Apr. 04, 2015
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Apr. 13, 2017
GNU Interest                            
Repayments of Notes Payable                     $ 75 $ 300 $ 26  
Gain on extinguishment of debt                       606    
Net revenue     $ 79,569 $ 81,691 $ 82,607 $ 80,912 $ 72,460 $ 76,525 $ 76,535 $ 78,039 324,779 303,559 306,371  
Net income (loss)     2,076 3,151 6,767 2,239 (2,589) 2,813 3,202 2,899 14,233 6,325 13,407  
Net income attributable to CRA International, Inc     $ 2,058 $ 3,193 5,215 $ 2,423 (1,307) $ 2,860 $ 3,325 2,779 $ 12,888 7,657 13,638  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU                            
Sale of GNU interest                            
Purchase price receivable $ 1,350                          
Purchase price received $ 1,100                          
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU | Future                            
Sale of GNU interest                            
Purchase price receivable                           $ 250
GNU                            
GNU Interest                            
Percentage of ownership interest held by the entity                     55.89%      
Notes Payable   $ 1,000                        
Repayments of Notes Payable   $ 400                        
Gain on extinguishment of debt                   $ 600        
Net revenue                     $ 800 3,800 4,800  
Net income (loss)                     3,000 (3,000) (500)  
Net income attributable to CRA International, Inc                     $ 1,700 $ 1,300 $ 200  
Goodwill and intangible asset impairment charges             $ 4,500              
GNU | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU                            
Sale of GNU interest                            
Gain on sale of interest in subsidiaries         3,800                  
CRA | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU                            
Sale of GNU interest                            
Gain on sale of interest in subsidiaries         $ 2,100