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Inventories (Schedule of Inventories) (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 826,863,000 | $ 692,261,000
Cost of sales | 2,049,675,000 | 1,833,000,000
Uranium [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Concentrate | 651,901,000 | 511,654,000
Broken ore | 27,892,000 | 71,463,000
Total inventory | 679,793,000 | 583,117,000
Fuel Services [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | 146,612,000 | 108,711,000
Other Segment [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 458,000 | $ 433,000

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