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Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Estimated Fair Value on a Recurring Basis (Details) - Fair Value Measurements Recurring - CAD ($) $ in Thousands | Jun. 30, 2026 | Mar. 31, 2026
--- | --- | ---
Assets: |  |
Restricted short-term investments | $ 5,058 | $ 5,046
Other investments | 123,568 | 106,025
Liabilities: |  |
Warrant derivative liability | 26,863 | 27,522
Level 1 |  |
Assets: |  |
Restricted short-term investments | 5,058 | 5,046
Other investments | 47 | 46
Level 3 |  |
Assets: |  |
Other investments | 123,521 | 105,979
Liabilities: |  |
Warrant derivative liability | $ 26,863 | $ 27,522

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