Cover - shares	3 Months Ended
	Jun. 30, 2020	Aug. 07, 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	001-37418
Entity Registrant Name	Axovant Gene Therapies Ltd.
Entity Incorporation, State or Country Code	D0
Entity Tax Identification Number	98-1333697
Entity Address, Address Line One	Suite 1, 3rd Floor
Entity Address, Address Line Two	11-12 St. James's Square
Entity Address, City or Town	London
Entity Address, Postal Zip Code	SW1Y 4LB
Entity Address, Country	GB
Country Region	44
City Area Code	203
Local Phone Number	997 8931
Title of 12(b) Security	Common Shares, par value $0.00001 per share
Trading Symbol	AXGT
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		41,956,478
Entity Central Index Key	0001636050
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1