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Inventories (Schedule of Inventories) (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 664,698,000 $ 409,521,000
Cost of sales 1,359,000,000 1,218,000,000
Uranium [member]    
Disclosure Of Operating Segments [Line Items]    
Concentrate 537,426,000 319,257,000
Broken ore 46,703,000 46,324,000
Total inventory 584,129,000 365,581,000
Fuel Services [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory 80,144,000 43,549,000
Other [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 425,000 $ 391,000