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Inventories (Schedule of Inventories) (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 664,698,000 | $ 409,521,000
Cost of sales | 1,359,000,000 | 1,218,000,000
Uranium [member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Concentrate | 537,426,000 | 319,257,000
Broken ore | 46,703,000 | 46,324,000
Total inventory | 584,129,000 | 365,581,000
Fuel Services [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | 80,144,000 | 43,549,000
Other [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 425,000 | $ 391,000

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