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Related parties (Details)
 12 Months Ended
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of transactions between related parties [line items]        
Short-term employee benefits $ 26,569,000 $ 17,673,000    
Share-based compensation 11,525,000 10,464,000    
Post-employment benefits 5,914,000 5,910,000    
Termination benefits 916,000 608,000    
Total compensation 44,924,000 34,655,000    
Advances receivable from JV Inkai LLP 58,820,000 90,095,000    
Cameco [member]        
Disclosure of transactions between related parties [line items]        
Advances receivable from JV Inkai LLP $ 58,820,000 $ 90,095,000    
Percentage of related party amounts receivable 40.00% 40.00% 40.00% 40.00%
Interest income $ 2,182,000 $ 2,155,000    
Key management personnel of entity or parent [member]        
Disclosure of transactions between related parties [line items]        
Description of any retirement benefit plan termination terms Upon resignation at the Company’s request, they are entitled to termination benefits of up to the lesser of 18 to 24 months or the period remaining until age 65. The termination benefits include gross salary plus the target short-term incentive bonus for the year in which termination occurs      
Inkai [Member]        
Disclosure of transactions between related parties [line items]        
Loan facilities     $ 175,000,000  
Interest rate basis LIBOR plus 2%      
Loan oustanding     $ 117,218,000 $ 167,750,000
Key management personnel resident [member] | Minimum [member]        
Disclosure of transactions between related parties [line items]        
Ownership in Cameco 25.00%   25.00%  
Key management personnel non-resident [member] | Maximum [member]        
Disclosure of transactions between related parties [line items]        
Ownership in Cameco 15.00%   15.00%