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TAXATION - Operating loss carryforwards (Details) - CAD ($)
$ in Thousands
Mar. 31, 2025
Mar. 31, 2024
Non-Canadian    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Operating loss carryforwards $ 223,442 $ 136,352
Canadian    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Operating loss carryforwards 9,204 11
Tax Period 1 | Non-Canadian    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Operating loss carryforwards 9,175 5,006
Tax Period 1 | Canadian    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Operating loss carryforwards 0 6
Tax Period 2 | Non-Canadian    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Operating loss carryforwards 26,350 16,720
Tax Period 2 | Canadian    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Operating loss carryforwards 9,204 5
No expiry | Non-Canadian    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Operating loss carryforwards 187,917 114,626
No expiry | Canadian    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Operating loss carryforwards 0 0
Capital loss carryforwards 86,269 89,433
No expiry | United States, Federal and State Tax Authority    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital loss carryforwards $ 566 $ 533