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Revenue - Disaggregation (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | $ 1,862,925 | $ 2,091,661
Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,413,809 | 1,684,056
Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 370,277 | 313,989
Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 78,839 | 93,616
Fixed price Contracts Member | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 724,107 | 954,249
Fixed price Contracts Member | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 349,021 | 577,143
Fixed price Contracts Member | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 305,383 | 293,400
Fixed price Contracts Member | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 69,703 | 83,706
Market Price Contracts Member [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,138,818 | 1,137,412
Market Price Contracts Member [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,064,788 | 1,106,913
Market Price Contracts Member [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 64,894 | 20,589
Market Price Contracts Member [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 9,136 | 9,910
Americas [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 835,061 | 956,481
Americas [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 569,535 | 695,678
Americas [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 206,226 | 191,791
Americas [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 59,300 | 69,012
Europe [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 371,350 | 335,789
Europe [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 288,134 | 275,096
Europe [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 79,629 | 50,000
Europe [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 3,587 | 10,693
Asia [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 656,514 | 799,391
Asia [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 556,140 | 713,282
Asia [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 84,422 | 72,198
Asia [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | $ 15,952 | $ 13,911

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