Quarterly report pursuant to Section 13 or 15(d)

Cover Page

Cover Page - shares
3 Months Ended
Jun. 30, 2020
Aug. 12, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2020  
Document Transition Report false  
Entity File Number 001-38906  
Entity Registrant Name IMMUNOVANT, INC.  
Entity Central Index Key 0001764013  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2020  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 83-2771572  
Entity Address, Address Line One 320 West 37th Street  
Entity Address, City or Town New York,  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10018  
City Area Code 917  
Local Phone Number 580-3099  
Title of 12(b) Security Common Stock, $0.0001 par value per share  
Trading Symbol IMVT  
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   81,811,727