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Inventories (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 680,369,000 $ 320,770,000
Cost of sales 1,435,000,000 1,398,000,000
Uranium [Member]    
Disclosure Of Operating Segments [Line Items]    
Concentrate 579,653,000 204,123,000
Broken ore 45,387,000 51,094,000
Total inventory 625,040,000 255,217,000
Fuel Services [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory 52,273,000 62,701,000
Other Segment [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 3,056,000 $ 2,852,000