Document and Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2020	Jun. 05, 2020	Sep. 30, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	Axovant Gene Therapies Ltd.
Entity Central Index Key	0001636050
Document Type	10-K
Document Period End Date	Mar. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		40,335,966
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Public Float			$ 61,445,020