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v3.24.2.u1

Note 1 - Nature of Operations and Going Concern (Details Textual) - CAD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024
Statement Line Items [Line Items] |  |
Retained earnings | $ (22,059,880) | $ (21,481,123)
Working capital deficiency | (1,587,213) | (1,247,161)
Revenue | $ 0 | $ 0

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

X
- Definition The amount of working capital deficiency. + References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration