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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2023
Feb. 23, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 30, 2023    
Current Fiscal Year End Date --12-30    
Document Transition Report false    
Entity File Number 000-24049    
Entity Registrant Name CRA International, Inc.    
Entity Incorporation, State or Country Code MA    
Entity Address, Address Line One 200 Clarendon Street    
Entity Address, City or Town Boston    
Entity Address, State or Province MA    
Entity Tax Identification Number 04-2372210    
Entity Address, Postal Zip Code 02116-5092    
City Area Code 617    
Local Phone Number 425-3000    
Title of Each Class Common Stock, no par value    
Trading Symbol(s) CRAI    
Name of Each Exchange on Which Registered NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 680.6
Entity Common Stock, Shares Outstanding   6,964,572  
Documents Incorporated by Reference
The information required for Part III of this annual report is incorporated by reference from the registrant's definitive proxy statement for the 2023 annual meeting of its shareholders to be filed with the Securities and Exchange Commission within 120 days after the end of the registrant's fiscal year ended December 30, 2023.
    
Entity Central Index Key 0001053706    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY