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Inventories (Details)
 12 Months Ended
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure Of Operating Segments [Line Items]        
Total inventory $ 949,766,000 $ 1,287,939,000    
Cost of sales 1,654,000,000 1,752,000,000    
Net write-down 8,662,000 18,054,000    
Uranium [Member]        
Disclosure Of Operating Segments [Line Items]        
Concentrate Inventory 820,426,000 989,202,000    
Broken ore inventory 47,083,000 45,581,000    
Total inventory 867,509,000 1,034,783,000    
NUKEM [Member]        
Disclosure Of Operating Segments [Line Items]        
Total inventory 13,801,000 141,040,000    
Inventory pledged as security under financing arrangements 0 4,884,000 $ 0 $ 3,637,000
Fuel Services [Member]        
Disclosure Of Operating Segments [Line Items]        
Total inventory $ 68,456,000 $ 112,116,000