v3.26.1
Cover - shares
 12 Months Ended
Jan. 31, 2026
Jun. 01, 2026
Document Information Line Items    
Entity Registrant Name BETTERLIFE PHARMA INC.  
Entity Central Index Key 0001464165  
Document Type 20-F  
Amendment Flag false  
Entity Voluntary Filers No  
Current Fiscal Year End Date --01-31  
Entity Well Known Seasoned Issuer No  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Document Period End Date Jan. 31, 2026  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2026  
Entity Common Stock Shares Outstanding   151,896,675
Document Annual Report true  
Document Transition Report false  
Document Fin Stmt Error Correction Flag false  
Entity File Number 333-161157  
Entity Incorporation State Country Code Z4  
Entity Address Address Line 1 1275 West 6th Avenue, #300  
Entity Address City Or Town Vancouver  
Entity Address State Or Province BC  
Entity Address Postal Zip Code V6H 1A6  
Auditor Name MNP LLP  
Auditor Location Vancouver, Canada  
Auditor Firm Id 1930  
Security 12b Title Common shares  
Trading Symbol BETR  
Entity Interactive Data Current Yes  
Document Shell Company Report false  
Document Registration Statement false  
Document Accounting Standard International Financial Reporting Standards  
Business Contact [Member]    
Document Information Line Items    
Entity Address Address Line 1 1275 West 6th Avenue, #300  
Entity Address City Or Town Vancouver  
Entity Address State Or Province BC  
Entity Address Postal Zip Code V6H 1A6  
Contact Personnel Email Address ahmad.doroudian@blifepharma.com  
Contact Personnel Name Ahmad Doroudian