v3.26.1
Income Taxes - Summary of Losses Carried Forward Available to Reduce Future Years' Taxable Income (Details)
$ in Thousands
Mar. 31, 2026
CAD ($)
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income $ 3,763,524
Losses carried forward available to reduce future years' taxable income 5,190,846
Expiring within 5 Years  
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income 1,864
Expiring between 5 and 10 Years  
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income 12,629
Expiring between 10 and 15 Years  
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income 853,917
Expiring between 15 and 20 years  
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income 2,313,166
Indefinite  
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income 581,948
Indefinite | Capital Loss Carry forward  
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income 1,427,322
CANADA  
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income 3,179,713
United States  
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income 505,295
Europe  
Operating Loss Carryforwards [Line Items]  
Losses carried forward available to reduce future years' taxable income $ 78,516