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Share-based compensation plans (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2023 CAD ($) shares Number_employees $ / shares | Dec. 31, 2022 CAD ($) Number_employees shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Stock options held | shares | 1,396,289 | 3,053,571
Options exercisable - Weighted average exercisable price | $ 14.73 | $ 15.75
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 | 32,196,059 |
Weighted average share price, exercise date | $ 45.19 | $ 30.88
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 | 830,279 | 1,255,255
Options exercisable - Weighted average exercisable price | $ 0 |
Weighted average share price, exercise date | $ 57.13 |
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 | 814,683 | 1,131,493
Options exercisable - Weighted average exercisable price | $ 0 |
Weighted average share price, exercise date | $ 57.13 |
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 | 2,838 | 2,603
Total number of shares purchased | shares | 100,379 | 116,530
Total amount of employer's contribution | $ | $ 4,460,000 | $ 3,541,000
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 | 564,401 | 547,304
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 | 45,551 | 94,135
Options exercisable - Weighted average exercisable price | $ 12.29 | $ 12.55
Weighted average share price, exercise date | $ 46.08 |
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 | 11.32
Phantom Stock Option Plan [member] | Maximum [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Exercise prices range | $ 15.27 | $ 19.30
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 | 28,000 | 21,148
Options exercisable - Weighted average exercisable price | $ 0 |
Weighted average share price, exercise date | $ 57.13 |
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 | $ | $ 79,771,000 | $ 59,577,000

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- Definition The description of the method of settlement (for example, whether in cash or equity) for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_a&doctype=Standard -URIDate 2023-03-23 + Details
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