v3.26.1
Income Taxes - Income Tax Loss Carryforwards (Details) - CAD ($)
$ in Thousands
Mar. 31, 2026
Mar. 31, 2025
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 2,458 $ 4,219
Income tax loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 1,170,258 $ 1,376,500
Income tax loss carryforwards | 2027 - 2031    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 210,927  
Income tax loss carryforwards | 2032 - 2036    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 197,109  
Income tax loss carryforwards | 2037 - 2041    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 528,595  
Income tax loss carryforwards | 2042 - 2046    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 105,281  
Income tax loss carryforwards | Foreign Unlimited    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 128,346