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Convertible Debentures - Summary of Detailed Information about Convertible Debentures (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Convertible debentures [line items]    
Beginning $ 158,478 $ 80,021
Fair value on issuance 330,916 143,702
Fair value adjustment (33,611) 50,177
Settlement with shares   (72,773)
Disposals due to deconsolidation of IsoEnergy   (42,649)
Ending 455,783 158,478
2023 Debentures [member]    
Convertible debentures [line items]    
Beginning 158,478  
Fair value on issuance   143,702
Fair value adjustment (408) 14,776
Ending 158,070 158,478
2020 Debentures [member]    
Convertible debentures [line items]    
Beginning   52,615
Fair value adjustment   20,158
Settlement with shares   (72,773)
2020 IsoEnergy Debentures [member]    
Convertible debentures [line items]    
Beginning   22,269
Fair value adjustment   13,938
Disposals due to deconsolidation of IsoEnergy   (36,207)
2022 IsoEnergy Debentures [member]    
Convertible debentures [line items]    
Beginning   5,137
Fair value adjustment   1,305
Disposals due to deconsolidation of IsoEnergy   $ (6,442)
2024 Debentures [member]    
Convertible debentures [line items]    
Fair value on issuance 330,916  
Fair value adjustment (33,203)  
Ending $ 297,713