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Inventories (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 320,770,000 $ 467,795,000
Cost of sales 1,398,000,000 1,501,000,000
Net write-down 0 29,296,000
Uranium [Member]    
Disclosure Of Operating Segments [Line Items]    
Concentrate 204,123,000 335,276,000
Broken ore 51,094,000 51,545,000
Total inventory 255,217,000 386,821,000
Fuel Services [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory 62,701,000 75,541,000
Other Segment [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 2,852,000 $ 5,433,000