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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, 2022 | Dec. 31, 2021
Disclosure of joint operations [line items] |  |  |
Total assets |  | $ 8,632,793 | $ 7,517,744
Joint operations [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Total assets |  | 2,745,245 | 2,854,340
Total liabilities |  | $ 328,730 | 349,779
McArthur River [Member] |  |  |
Disclosure of joint operations [line items] |  |  |
Ownership |  | 69.81% |
Principal place of business |  | Canada |
Total assets |  | $ 998,368 | 1,010,956
Total liabilities |  | $ 37,881 | 36,697
Key Lake [Member] |  |  |
Disclosure of joint operations [line items] |  |  |
Ownership |  | 83.33% |
Principal place of business |  | Canada |
Total assets |  | $ 527,841 | 549,051
Total liabilities |  | $ 240,487 | 267,579
Cigar Lake [Member] |  |  |
Disclosure of joint operations [line items] |  |  |
Ownership |  | 54.55% |
Principal place of business |  | Canada |
Total assets |  | $ 1,219,036 | 1,294,333
Total liabilities |  | $ 50,362 | $ 45,503
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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