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Financial instruments and related risk management (Narrative) (Details)
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Jan. 13, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2022
CAD ($)
Disclosure of detailed information about financial instruments [line items]          
Cash and cash equivalents $ 600,462,000 $ 566,809,000     $ 1,143,674,000
Pledged cash as security $ 162,276,000        
Collateral account term 5 years        
Trade receivable held as collateral $ 0        
Repayment of outstanding balance     $ 200,000,000    
US Term Loan, Tranche One [Member] | Floating interest rate [Member]          
Disclosure of detailed information about financial instruments [line items]          
Notional amount       $ 200,000,000  
Borrowing, interest rate basis 1.80%     1.80%  
Bottom of range [Member]          
Disclosure of detailed information about financial instruments [line items]          
Quoted market yields 2.80% 3.10%      
Top of range [Member]          
Disclosure of detailed information about financial instruments [line items]          
Quoted market yields 3.30% 4.90%      
Credit risk [Member]          
Disclosure of detailed information about financial instruments [line items]          
Cash and cash equivalents $ 600,462,000 $ 566,809,000      
Interest rate risk [Member]          
Disclosure of detailed information about financial instruments [line items]          
Proportion of outstanding debt that carries fixed rate 72.00% 51.00%      
Interest rate risk [Member] | Interest rate contracts [Member]          
Disclosure of detailed information about financial instruments [line items]          
Percentage increase in interest rate 1.00%        
Fair value of Cameco's interest rate swap net liability $ 3,172,000 $ 5,819,000      
Interest rate risk [Member] | Interest rate contracts [Member] | Series H Senior Unsecured Debenture [Member]          
Disclosure of detailed information about financial instruments [line items]          
Notional amount $ 75,000,000        
Interest rate risk [Member] | Interest rate contracts [Member] | Series H Senior Unsecured Debenture [Member] | Floating interest rate [Member]          
Disclosure of detailed information about financial instruments [line items]          
Interest rate basis the daily Canada Overnight Repo Rate Average        
Margin rate 1.30%     1.30%  
Interest rate risk [Member] | Interest rate contracts [Member] | Series H Senior Unsecured Debenture [Member] | Fixed interest rate [Member]          
Disclosure of detailed information about financial instruments [line items]          
Margin rate 2.95%     2.95%