Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.19.3.a.u2
Cover - shares
9 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Document Information [Line Items]    
Entity Registrant Name Immunovant, Inc.  
Entity Central Index Key 0001764013  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Document Type 10-Q  
Document Period End Date Dec. 31, 2019  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2019  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company true  
Entity Small Business true  
Entity Shell Company false  
Entity Ex Transition Period true  
Entity Common Stock, Shares Outstanding   56,455,376
Entity File Number 001-38906  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Entity Tax Identification Number 83-2771572  
Entity Incorporation, State or Country Code DE  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10018  
Entity Address, Address Line One 320 West 37th Street, 3RD FL  
Entity Address, City or Town NY  
Common Stock [Member]    
Document Information [Line Items]    
Trading Symbol IMVT  
Security Exchange Name NASDAQ  
Title of 12(b) Security Common Stock  
Warrant [Member]    
Document Information [Line Items]    
Trading Symbol IMVTW  
Security Exchange Name NASDAQ  
Title of 12(b) Security Warrants to receive one half of one share of Common Stock  
Capital Unit [Member]    
Document Information [Line Items]    
Trading Symbol IMVTU  
Security Exchange Name NASDAQ  
Title of 12(b) Security Units, each consisting of one share of Common Stock and one Warrant to receive one half of one share of Common Stock