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v3.19.1

Revenue - Future sales commitments (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 CAD ($)
Reportable Segments Member |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | $ 2,745,133
Reportable Segments Member | USD [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Average Foreign Exchange Rate | 1.3
Reportable Segments Member | 2019 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | $ 550,108
Reportable Segments Member | 2020 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 402,592
Reportable Segments Member | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 351,558
Reportable Segments Member | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 312,274
Reportable Segments Member | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 247,093
Reportable Segments Member | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 881,508
Uranium [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 956,896
Uranium [Member] | 2019 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 277,396
Uranium [Member] | 2020 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 182,711
Uranium [Member] | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 110,353
Uranium [Member] | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 112,459
Uranium [Member] | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 107,362
Uranium [Member] | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 166,615
Fuel Services [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 1,747,834
Fuel Services [Member] | 2019 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 240,551
Fuel Services [Member] | 2020 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 215,851
Fuel Services [Member] | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 236,993
Fuel Services [Member] | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 199,815
Fuel Services [Member] | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 139,731
Fuel Services [Member] | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 714,893
Other Segment [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 40,403
Other Segment [Member] | 2019 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 32,161
Other Segment [Member] | 2020 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 4,030
Other Segment [Member] | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 4,212
Other Segment [Member] | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 0
Other Segment [Member] | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 0
Other Segment [Member] | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | $ 0

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