XML 20 R1.htm IDEA: XBRL DOCUMENT v3.21.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
May 17, 2021
Cover [Abstract]    
Entity Registrant Name Replimune Group, Inc.  
Entity Central Index Key 0001737953  
Document Type 10-K  
Document Period End Date Mar. 31, 2021  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Public Float $ 500.2  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Common Stock, Shares Outstanding   46,608,958
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus FY  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol REPL  
Security Exchange Name NASDAQ