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Revenue - Future sales commitments (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 CAD ($)
Reportable Segments Member |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | $ 3,243,838
USD/CAD average foreign exchange rate | 1.3
Reportable Segments Member | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | $ 567,132
Reportable Segments Member | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 462,271
Reportable Segments Member | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 391,867
Reportable Segments Member | 2024 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 382,310
Reportable Segments Member | 2025 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 345,700
Reportable Segments Member | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 1,094,558
Uranium [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 1,324,610
Uranium [Member] | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 243,069
Uranium [Member] | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 189,351
Uranium [Member] | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 179,212
Uranium [Member] | 2024 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 166,581
Uranium [Member] | 2025 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 129,450
Uranium [Member] | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 416,947
Fuel Services [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 1,915,016
Fuel Services [Member] | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 319,851
Fuel Services [Member] | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 272,920
Fuel Services [Member] | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 212,655
Fuel Services [Member] | 2024 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 215,729
Fuel Services [Member] | 2025 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 216,250
Fuel Services [Member] | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 677,611
Other Segment [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 4,212
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] | 2024 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 0
Other Segment [Member] | 2025 [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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