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Revenue - Disaggregation (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | $ 1,800,073 | $ 1,862,925
Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,411,770 | 1,413,809
Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 377,296 | 370,277
Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 11,007 | 78,839
Fixed price Contracts Member | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 769,259 | 724,107
Fixed price Contracts Member | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 406,021 | 349,021
Fixed price Contracts Member | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 355,552 | 305,383
Fixed price Contracts Member | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 7,686 | 69,703
Market Price Contracts Member [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,030,814 | 1,138,818
Market Price Contracts Member [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,005,749 | 1,064,788
Market Price Contracts Member [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 21,744 | 64,894
Market Price Contracts Member [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 3,321 | 9,136
Americas [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 802,514 | 835,061
Americas [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 588,827 | 569,535
Americas [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 206,011 | 206,226
Americas [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 7,676 | 59,300
Europe [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 450,760 | 371,350
Europe [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 323,565 | 288,134
Europe [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 123,864 | 79,629
Europe [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 3,331 | 3,587
Asia [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 546,799 | 656,514
Asia [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 499,378 | 556,140
Asia [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 47,421 | 84,422
Asia [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | $ 0 | $ 15,952

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