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Investment In Associate - Summary Of Financial Information For Iso Energy (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Disclosure Of Detailed Information About Financial Information [Line Items]        
Cash $ 476,587 $ 290,743 $ 134,447 $ 134,447
Marketable securities 0 0 5,775  
Total assets 1,657,243 1,007,425 554,560  
Current liabilities 478,111 186,390 96,588  
Total liabilities 478,202 187,406 $ 99,143  
Loss for the period (77,559) 70,168    
Other comprehensive loss (income) 14,058 (2,422)    
Total comprehensive loss (63,501) 67,746    
IsoEnergy Ltd. [member]        
Disclosure Of Detailed Information About Financial Information [Line Items]        
Cash 21,295 37,033    
Other current assets 7,110 1,192    
Marketable securities 31,181 17,036    
Non-current assets 281,249 291,937    
Total assets 340,835 347,198    
Current liabilities 35,104 41,065    
Non-current liabilities 2,568 3,113    
Total liabilities 37,672 44,178    
Loss for the period 42,135 18,689    
Other comprehensive loss (income) (10,172) 2,618    
Total comprehensive loss $ 31,963 $ 21,307