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Revenue - Disaggregation (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reportable Segments Member    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers $ 1,800,073 $ 1,862,925
Uranium [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 1,411,770 1,413,809
Fuel Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 377,296 370,277
Other Segment [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 11,007 78,839
Fixed price Contracts Member | Reportable Segments Member    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 769,259 724,107
Fixed price Contracts Member | Uranium [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 406,021 349,021
Fixed price Contracts Member | Fuel Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 355,552 305,383
Fixed price Contracts Member | Other Segment [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 7,686 69,703
Market Price Contracts Member [Member] | Reportable Segments Member    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 1,030,814 1,138,818
Market Price Contracts Member [Member] | Uranium [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 1,005,749 1,064,788
Market Price Contracts Member [Member] | Fuel Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 21,744 64,894
Market Price Contracts Member [Member] | Other Segment [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 3,321 9,136
Americas [Member] | Reportable Segments Member    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 802,514 835,061
Americas [Member] | Uranium [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 588,827 569,535
Americas [Member] | Fuel Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 206,011 206,226
Americas [Member] | Other Segment [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 7,676 59,300
Europe [Member] | Reportable Segments Member    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 450,760 371,350
Europe [Member] | Uranium [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 323,565 288,134
Europe [Member] | Fuel Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 123,864 79,629
Europe [Member] | Other Segment [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 3,331 3,587
Asia [Member] | Reportable Segments Member    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 546,799 656,514
Asia [Member] | Uranium [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 499,378 556,140
Asia [Member] | Fuel Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers 47,421 84,422
Asia [Member] | Other Segment [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]    
Revenue From Contracts With Customers $ 0 $ 15,952