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Revenue - Future sales commitments (Details)
$ in Thousands
 12 Months Ended
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