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Cover - shares
 6 Months Ended
Sep. 30, 2023
Nov. 03, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2023  
Document Transition Report false  
Entity File Number 001-38596  
Entity Registrant Name REPLIMUNE GROUP, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 82-2082553  
Entity Address, Address Line One 500 Unicorn Park Drive  
Entity Address, Address Line Two Suite 303  
Entity Address, City or Town Woburn  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 01801  
City Area Code 781  
Local Phone Number 222-9600  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol REPL  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   59,059,343
Entity Central Index Key 0001737953  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2