v3.26.1
Asset Dispositions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 27, 2027
Oct. 27, 2026
Oct. 27, 2025
Oct. 22, 2025
Sep. 14, 2025
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Disclosure of analysis of single amount of discontinued operations [line items]                
Mineral property, plant and equipment             $ 4,957,500 $ 4,618,000
Impairment loss (reversal of impairment loss) recognised in profit or loss             (218,800) (57,100)
Deferred payment consideration (Note 7)             157,100 0
Deferred payment consideration (Note 7)             142,000 0
Pre-tax gain             231,000 0
Plant and equipment(v)                
Disclosure of analysis of single amount of discontinued operations [line items]                
Mineral property, plant and equipment             1,628,600 1,629,500
Quartz Mountain                
Disclosure of analysis of single amount of discontinued operations [line items]                
Cash consideration paid (received)       $ 2,800        
Transaction costs       100        
Discontinued operations | Turkish Subsidiary                
Disclosure of analysis of single amount of discontinued operations [line items]                
Total consideration     $ 157,300   $ 470,000      
Cash consideration paid (received)     (160,000)          
Impairment loss (reversal of impairment loss) recognised in profit or loss             (218,800) $ (57,100)
Transaction costs     2,700          
Deferred payment consideration (Note 7)     153,100          
Deferred payment consideration (Note 7)     137,200          
Pre-tax gain             229,700  
Discontinued operations | Quartz Mountain                
Disclosure of analysis of single amount of discontinued operations [line items]                
Total consideration       $ 18,200   $ 21,000    
Cash consideration, receivable, period       3 years        
Proportion of ownership interest, sold           100.00%    
Percentage of voting equity interests sold           9.90%    
Portion of consideration received, number of shares (in shares)       13,924,702        
Portion of consideration received consisting of equity interest       9.99%        
Portion of consideration receivable, guaranteed payments       $ 8,200        
Portion of consideration receivable, milestone payments       10,000        
Deferred payment consideration (Note 7)     3,200          
Deferred payment consideration (Note 7)     $ 3,400          
Pre-tax gain             $ 1,300  
Fair value of shares at closing       $ 2,900        
Discontinued operations | Forecast | Turkish Subsidiary                
Disclosure of analysis of single amount of discontinued operations [line items]                
Cash consideration paid (received) $ (150,000) $ (160,000)            
Cash consideration, receivable, period 2 years 1 year