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Note 9 - Segmented Information (Tables) | 12 Months Ended
--- | ---
Mar. 31, 2024
Statement Line Items [Line Items] |
Disclosure of geographical areas [text block] |
|  | June 30, 2024 |  |  | March 31, 2024 |
Exploration and evaluation assets: |  |  |  |  |  |  |  |
Canada |  | $ | 13,975,934 |  |  | $ | 13,336,387 |
United States |  |  | 1,766,278 |  |  |  | 1,758,026 |
|  | $ | 15,742,212 |  |  | $ | 15,094,413 |

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- References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:textBlockItemType
Balance Type: | na
Period Type: | duration