Cover - shares	3 Months Ended
	Jun. 30, 2023	Aug. 04, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	001-38906
Entity Registrant Name	IMMUNOVANT, INC.
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	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		130,671,667
Entity Central Index Key	0001764013
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2024