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Joint operations (Joint operations proportionate interest in net assets table) (Details) - CAD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
May 19, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of joint operations [line items] |  |  |
Total assets |  | $ 9,934,057 | $ 8,632,793
Joint operations [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Total assets |  | 2,711,837 | 2,745,245
Total liabilities |  | $ 343,646 | 328,730
McArthur River [Member] |  |  |
Disclosure of joint operations [line items] |  |  |
Ownership |  | 69.81% |
Principal place of business |  | Canada |
Total assets |  | $ 1,048,746 | 998,368
Total liabilities |  | $ 50,199 | 37,881
Key Lake [Member] |  |  |
Disclosure of joint operations [line items] |  |  |
Ownership |  | 83.33% |
Principal place of business |  | Canada |
Total assets |  | $ 504,508 | 527,841
Total liabilities |  | $ 244,480 | 240,487
Cigar Lake [Member] |  |  |
Disclosure of joint operations [line items] |  |  |
Ownership |  | 54.55% |
Principal place of business |  | Canada |
Total assets |  | $ 1,158,583 | 1,219,036
Total liabilities |  | $ 48,967 | $ 50,362
Cigar Lake [Member] | Before acquiring additional interest in Joint Venture [Member] |  |  |
Disclosure of joint operations [line items] |  |  |
Ownership | 50.025% |  |
Cigar Lake [Member] | Idemitsu [Member] |  |  |
Disclosure of joint operations [line items] |  |  |
Participating interest held in Joint Venture | 7.875% |  |

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