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Cover Page - shares
6 Months Ended
Dec. 31, 2023
Feb. 13, 2024
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2023  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2  
Entity Registrant Name Renalytix plc  
Entity Central Index Key 0001811115  
Current Fiscal Year End Date --06-30  
Entity Tax Identification Number 00-0000000  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Interactive Data Current Yes  
Entity Common Stock, Shares Outstanding   99,930,156
Entity Address, Address Line One Finsgate5-7 Cranwood Street  
Entity Address, City or Town London  
Entity Address, Postal Zip Code EC1V 9EE  
Entity Address, Country GB  
Document Quarterly Report true  
Document Transition Report false  
Securities Act File Number 001-39387  
No Trading Symbol Flag true  
Title of 12(b) Security Ordinary shares, nominal value £0.0025 per share  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code X0  
City Area Code 20  
Local Phone Number 3139 2910  
American Depositary Shares [Member]    
Document Information [Line Items]    
Trading Symbol RNLX  
Title of 12(b) Security American Depositary Shares, each representing two ordinary shares, nominal value £0.0025 per share  
Security Exchange Name NASDAQ