v3.26.1
Document And Entity Information
 12 Months Ended
Mar. 31, 2026
shares
Document Information [Line Items]  
Entity Central Index Key 0001935418
Entity Registrant Name Foremost Clean Energy Ltd.
Amendment Flag false
Current Fiscal Year End Date --03-31
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2026
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Mar. 31, 2026
Document Transition Report false
Document Shell Company Report false
Entity Incorporation, State or Country Code A1
Entity Address, Address Line One 750 West Pender Street, Suite 250
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Postal Zip Code V7Y 1K3
Entity Address, Country CA
Title of 12(b) Security Common Shares, no par value
Trading Symbol FMST
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 16,280,580
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company true
Entity Ex Transition Period false
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Auditor Firm ID 731
Auditor Name DAVIDSON & COMPANY LLP
Auditor Location Vancouver, Canada
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 750 West Pender Street, Suite 250
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Postal Zip Code V7Y 1K3
Entity Address, Country CA
Contact Personnel Name Jason Barnard
City Area Code 604
Local Phone Number 330-8067