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Share-based compensation plans (Narrative) (Details)
 12 Months Ended
Dec. 31, 2024
CAD ($)
shares
Number_employees
$ / shares
Dec. 31, 2023
CAD ($)
shares
Number_employees
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Stock options held | shares 259,958 1,396,289
Options exercisable - Weighted average exercisable price $ 15.05 $ 14.73
Stock Option Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Authorized shares | shares 43,017,198  
Outstanding shares | shares 33,332,390  
Weighted average share price, exercise date $ 69.86 $ 45.19
Expiration period for share-based payment arrangement 8 years  
Stock Option Plan [Member] | Minimum [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting term for share-based payment arrangement 1 year  
Stock Option Plan [Member] | Maximum [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting term for share-based payment arrangement 3 years  
Performance Share Unit Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period description three-year vesting period  
Stock options held | shares 636,588 830,279
Options exercisable - Weighted average exercisable price $ 0  
Weighted average share price, exercise date $ 73.91  
Vesting term for share-based payment arrangement 3 years  
Restricted Share Unit Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period description The RSUs carry vesting periods of one to three years  
Stock options held | shares 734,000 814,683
Options exercisable - Weighted average exercisable price $ 0  
Weighted average share price, exercise date $ 73.91  
Restricted Share Unit Plan [Member] | Minimum [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting term for share-based payment arrangement 1 year  
Restricted Share Unit Plan [Member] | Maximum [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting term for share-based payment arrangement 3 years  
Employee Share Ownership Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period description Shares purchased with Company contributions and with dividends paid on such shares become unrestricted 12 months from the date on which such shares were purchased  
Employers contribution per employee Under the plan, employees have the opportunity to participate in the program to a maximum of 6% of eligible earnings each year with Cameco matching the first 3% of employee-paid shares by 50%. Cameco contributes $1,000 of shares annually to each employee that is enrolled in the plan  
Number of participants | Number_employees 3,065 2,838
Total number of shares purchased | shares 76,926 100,379
Total amount of employer's contribution | $ $ 4,881,000 $ 4,460,000
Deferred Share Unit Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period description Each DSU fully vests upon award  
Stock options held | shares 310,604 564,401
Description of method of settlement for share-based payment arrangement 60% of each director’s annual retainer is paid in DSUs. In addition, on an annual basis, directors can elect to receive 25%, 50%, 75% or 100% of the remaining 40% of their annual retainer and any additional fees in the form of DSUs  
Phantom Stock Option Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period description vest over three years and expire eight years from the date granted  
Stock options held | shares 35,361 45,551
Options exercisable - Weighted average exercisable price $ 12.48 $ 12.29
Weighted average share price, exercise date $ 61.98  
Vesting term for share-based payment arrangement 3 years  
Expiration period for share-based payment arrangement 8 years  
Phantom Stock Option Plan [Member] | Minimum [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Exercise prices range $ 11.61 11.61
Phantom Stock Option Plan [Member] | Maximum [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Exercise prices range $ 15.27 $ 15.27
Phantom Restricted Share Unit Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period description The PRSUs carry vesting periods of one to three years  
Stock options held 25,560 28,000
Options exercisable - Weighted average exercisable price $ 0  
Weighted average share price, exercise date $ 73.91  
Phantom Restricted Share Unit Plan [Member] | Minimum [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting term for share-based payment arrangement 1 year  
Phantom Restricted Share Unit Plan [Member] | Maximum [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting term for share-based payment arrangement 3 years  
Cash Settled Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Liabilities from share-based payment transactions | $ $ 65,881,000 $ 79,792,000