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Revenue - Future sales commitments (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 CAD ($)
Reportable Segments Member |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | $ 3,123,998
USD/CAD average foreign exchange rate | 1.3
Reportable Segments Member | 2020 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | $ 550,427
Reportable Segments Member | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 452,760
Reportable Segments Member | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 358,482
Reportable Segments Member | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 319,500
Reportable Segments Member | 2024 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 316,788
Reportable Segments Member | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 1,126,041
Uranium [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 1,468,662
Uranium [Member] | 2020 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 271,642
Uranium [Member] | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 183,422
Uranium [Member] | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 145,920
Uranium [Member] | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 169,234
Uranium [Member] | 2024 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 166,015
Uranium [Member] | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 532,429
Fuel Services [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 1,647,094
Fuel Services [Member] | 2020 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 274,755
Fuel Services [Member] | 2021 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 265,126
Fuel Services [Member] | 2022 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 212,562
Fuel Services [Member] | 2023 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 150,266
Fuel Services [Member] | 2024 [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 150,773
Fuel Services [Member] | Thereafter [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 593,612
Other Segment [Member] |
Disclosure of transaction price allocated to remaining performance obligations [Line Items] |
Transaction Price Allocated To Remaining Performance Obligations | 8,242
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] | 2024 [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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