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Inventories (Schedule of Inventories) (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 826,863,000 $ 692,261,000
Cost of sales 2,049,675,000 1,833,000,000
Uranium [Member]    
Disclosure Of Operating Segments [Line Items]    
Concentrate 651,901,000 511,654,000
Broken ore 27,892,000 71,463,000
Total inventory 679,793,000 583,117,000
Fuel Services [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory 146,612,000 108,711,000
Other Segment [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 458,000 $ 433,000