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Inventories (Schedule of Inventories) (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 692,261,000 | $ 664,698,000
Cost of sales | 1,833,000,000 | 1,359,000,000
Uranium [member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Concentrate | 511,654,000 | 537,426,000
Broken ore | 71,463,000 | 46,703,000
Total inventory | 583,117,000 | 584,129,000
Fuel Services [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | 108,711,000 | 80,144,000
Other [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 433,000 | $ 425,000

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