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Revenue (Disaggregation) (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | $ 2,587,758 | $ 1,868,003
Uranium [member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 2,152,242 | 1,480,146
Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 425,557 | 365,063
Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 9,959 | 22,794
Fixed price Contracts Member | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,246,206 | 856,825
Fixed price Contracts Member | Uranium [member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 821,958 | 478,552
Fixed price Contracts Member | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 414,289 | 355,479
Fixed price Contracts Member | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 9,959 | 22,794
Market Price Contracts Member [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,341,552 | 1,011,178
Market Price Contracts Member [Member] | Uranium [member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,330,284 | 1,001,594
Market Price Contracts Member [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 11,268 | 9,584
Market Price Contracts Member [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 0 | 0
Americas [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,361,319 | 1,115,968
Americas [Member] | Uranium [member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,043,475 | 806,915
Americas [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 307,885 | 289,028
Americas [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 9,959 | 20,025
Europe [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 680,827 | 339,483
Europe [Member] | Uranium [member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 592,068 | 284,602
Europe [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 88,759 | 52,112
Europe [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 0 | 2,769
Asia [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 545,612 | 412,552
Asia [Member] | Uranium [member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 516,699 | 388,629
Asia [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 28,913 | 23,923
Asia [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | $ 0 | $ 0

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