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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% |

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