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Inventories (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 467,795,000 $ 949,766,000
Cost of sales 1,501,000,000 1,601,000,000
Net write-down 29,296,000 8,662,000
Uranium [Member]    
Disclosure Of Operating Segments [Line Items]    
Concentrate 255,373,000 820,426,000
Broken ore 51,545,000 47,083,000
Total inventory 306,918,000 867,509,000
Fuel Services [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory 75,223,000 68,456,000
Other Segment [Member] | Nukem [Member]    
Disclosure Of Operating Segments [Line Items]    
Total inventory $ 85,654,000 $ 13,801,000