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Inventories (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 680,369,000 | $ 320,770,000
Cost of sales | 1,435,000,000 | 1,398,000,000
Uranium [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Concentrate | 579,653,000 | 204,123,000
Broken ore | 45,387,000 | 51,094,000
Total inventory | 625,040,000 | 255,217,000
Fuel Services [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | 52,273,000 | 62,701,000
Other Segment [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 3,056,000 | $ 2,852,000

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