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Joint operations (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of joint operations [line items]    
Ownership 40.00% 60.00%
Total assets $ 8,018,636 $ 7,778,727
Joint operations [member]    
Disclosure of joint operations [line items]    
Total assets 3,106,658 3,365,818
Total liabilities $ 293,676 339,795
McArthur River [Member]    
Disclosure of joint operations [line items]    
Ownership 69.81%  
Principal place of business Canada  
Total assets $ 1,065,562 1,121,509
Total liabilities $ 32,829 38,896
Key Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 83.33%  
Principal place of business Canada  
Total assets $ 537,233 482,879
Total liabilities $ 222,369 140,214
Cigar Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 50.03%  
Principal place of business Canada  
Total assets $ 1,503,863 1,531,150
Total liabilities $ 38,478 $ 40,687
Inkai [Member]    
Disclosure of joint operations [line items]    
Ownership 40.00% 60.00%
Principal place of business Kazakhstan  
Total assets $ 0 $ 230,280
Total liabilities $ 0 $ 119,998
Percentage of interest in advances receivable 40.00%