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Cover
 12 Months Ended
Mar. 31, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Financial Statement Error Correction [Flag] false
Document Shell Company Report false
Entity Interactive Data Current Yes
Document Accounting Standard International Financial Reporting Standards
ICFR Auditor Attestation Flag false
Amendment Flag false
Document Period End Date Mar. 31, 2025
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Entity Information [Line Items]  
Entity Registrant Name Psyence Biomedical Ltd.
Entity Central Index Key 0001985062
Entity File Number 001-41937
Entity Incorporation, State or Country Code A6
Current Fiscal Year End Date --03-31
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Shell Company false
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One 121 Richmond Street West
Entity Address, Address Line Two Penthouse Suite 1300
Entity Address, City or Town Toronto
Entity Address, State or Province ON
Entity Address, Country CA
Entity Address, Postal Zip Code M5H 2K1
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 568,021
Common shares, without par value  
Entity Listings [Line Items]  
Title of 12(b) Security Common shares, without par value
Trading Symbol PBM
Security Exchange Name NASDAQ
Warrants, each exercisable to purchase one Common Share at an exercise price of $11.50 per share  
Entity Listings [Line Items]  
Title of 12(b) Security Warrants, each exercisable to purchase one Common Share at an exercise price of $6,874.13 per share
Trading Symbol PBMWW
Security Exchange Name NASDAQ
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name Neil Maresky
Entity Address, Address Line One 121 Richmond Street West
Entity Address, Address Line Two Penthouse Suite 1300
Entity Address, City or Town Toronto
Entity Address, State or Province ON
Entity Address, Postal Zip Code M5H 2K1
Entity Phone Fax Numbers [Line Items]  
City Area Code +1 (416)
Local Phone Number 346-7764