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Revenue - Disaggregation (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | $ 2,091,661 | $ 2,156,852
Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,684,056 | 1,574,068
Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 313,989 | 312,888
Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 93,616 | 269,896
Fixed price Contracts Member | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 954,249 | 1,042,243
Fixed price Contracts Member | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 577,143 | 502,437
Fixed price Contracts Member | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 293,400 | 287,104
Fixed price Contracts Member | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 83,706 | 252,702
Market Price Contracts Member [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,137,412 | 1,114,609
Market Price Contracts Member [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 1,106,913 | 1,071,631
Market Price Contracts Member [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 20,589 | 25,784
Market Price Contracts Member [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 9,910 | 17,194
Americas [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 956,481 | 1,052,053
Americas [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 695,678 | 737,095
Americas [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 191,791 | 209,285
Americas [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 69,012 | 105,673
Europe [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 335,789 | 472,680
Europe [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 275,096 | 318,446
Europe [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 50,000 | 52,642
Europe [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 10,693 | 101,592
Asia [Member] | Reportable Segments Member |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 799,391 | 632,119
Asia [Member] | Uranium [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 713,282 | 518,527
Asia [Member] | Fuel Services [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | 72,198 | 50,961
Asia [Member] | Other Segment [Member] |  |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items] |  |
Revenue From Contracts With Customers | $ 13,911 | $ 62,631

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_113_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_114&doctype=Standard -URIDate 2018-03-16 + Details
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