v3.26.1
Cover
 12 Months Ended
Mar. 31, 2026
shares
Document Information Line Items  
Entity Registrant Name AMARC RESOURCES LTD.
Entity Central Index Key 0001175596
Document Type 20-F
Amendment Flag false
Entity Voluntary Filers No
Current Fiscal Year End Date --03-31
Entity Well Known Seasoned Issuer No
Entity Shell Company false
Entity Emerging Growth Company true
Entity Current Reporting Status Yes
Document Period End Date Mar. 31, 2026
Entity Filer Category Non-accelerated Filer
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2026
Entity Ex Transition Period false
Entity Common Stock Shares Outstanding 225,377,364
Document Annual Report true
Document Transition Report false
Document Fin Stmt Error Correction Flag false
Entity File Number 0-49869
Entity Incorporation State Country Code Z4
Entity Address Address Line 1 14th Floor
Entity Address Address Line 2 1040 West Georgia Street
Entity Address City Or Town Vancouver
Entity Address Country CA
Entity Address Postal Zip Code V6E 4H1
Auditor Name DeVisser Gray LLP
Auditor Location Vancouver, Canada
Auditor Firm Id 1054
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 14th Floor
Entity Address Address Line 2 1040 West Georgia Street
Entity Address City Or Town Vancouver
Entity Address Country CA
Entity Address Postal Zip Code V6E 4H1
City Area Code 604
Local Phone Number 684-6365
Contact Personnel Email Address carolli@amarcresources.com
Contact Personnel Name Carol Li
Phone Fax Number Description (604) 639-9209