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Financial instruments (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2021 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents | $ 566,809,000 |  | $ 1,143,674,000 |  | $ 1,247,447,000
Short-term investments | 0 |  | $ 1,138,174,000 |  |
Pledged cash as security | $ 156,274,000 |  |  |  |
Collateral account term | 5 years | 5 years |  |  |
Trade receivable held as collateral | $ 0 |  |  |  |
US Term Loan, Tranche One [Member] | Floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount |  |  |  | $ 300,000,000 |
Borrowing, interest rate basis | 1.80% |  |  | 1.80% |
US Term Loan Tranche Two [Member] | Floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount |  |  |  | $ 300,000,000 |
Borrowing, interest rate basis | 2.05% |  |  | 2.05% |
Bottom of range [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Quoted market yields | 3.10% | 3.10% | 3.30% |  |
Top of range [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Quoted market yields | 4.90% | 4.90% | 4.20% |  |
Provision of guarantees or collateral by entity related party transactions | $ 278,006,000 | $ 209,927,000 |  |  |
Credit risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents | 566,809,000 |  | $ 1,143,674,000 |  |
Short-term investments | $ 0 |  | $ 1,138,174,000 |  |
Interest rate risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Proportion of outstanding debt that carries fixed rate | 51.00% | 51.00% | 92.00% |  |
Interest rate risk [member] | Interest rate contracts [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Percentage increase in interest rate | 1.00% | 1.00% |  |  |
Fair value of Cameco's interest rate swap net liability | $ 5,819,000 |  | $ 7,284,000 |  |
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 three-month Canada Dealer Offered Rate | the three-month Canada Dealer Offered Rate |  |  |
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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