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Inventories (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 320,770,000 | $ 467,795,000
Cost of sales | 1,398,000,000 | 1,501,000,000
Net write-down | 0 | 29,296,000
Uranium [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Concentrate | 204,123,000 | 335,276,000
Broken ore | 51,094,000 | 51,545,000
Total inventory | 255,217,000 | 386,821,000
Fuel Services [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | 62,701,000 | 75,541,000
Other Segment [Member] |  |
Disclosure Of Operating Segments [Line Items] |  |
Total inventory | $ 2,852,000 | $ 5,433,000

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