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Revenue - Disaggregation (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reportable Segments Member
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	$ 2,091,661	$ 2,156,852
Uranium [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	1,684,056	1,574,068
Fuel Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	313,989	312,888
Other Segment [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	93,616	269,896
Fixed price Contracts Member | Reportable Segments Member
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	954,249	1,042,243
Fixed price Contracts Member | Uranium [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	577,143	502,437
Fixed price Contracts Member | Fuel Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	293,400	287,104
Fixed price Contracts Member | Other Segment [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	83,706	252,702
Market Price Contracts Member [Member] | Reportable Segments Member
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	1,137,412	1,114,609
Market Price Contracts Member [Member] | Uranium [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	1,106,913	1,071,631
Market Price Contracts Member [Member] | Fuel Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	20,589	25,784
Market Price Contracts Member [Member] | Other Segment [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	9,910	17,194
Americas [Member] | Reportable Segments Member
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	956,481	1,052,053
Americas [Member] | Uranium [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	695,678	737,095
Americas [Member] | Fuel Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	191,791	209,285
Americas [Member] | Other Segment [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	69,012	105,673
Europe [Member] | Reportable Segments Member
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	335,789	472,680
Europe [Member] | Uranium [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	275,096	318,446
Europe [Member] | Fuel Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	50,000	52,642
Europe [Member] | Other Segment [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	10,693	101,592
Asia [Member] | Reportable Segments Member
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	799,391	632,119
Asia [Member] | Uranium [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	713,282	518,527
Asia [Member] | Fuel Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	72,198	50,961
Asia [Member] | Other Segment [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [line items]
Revenue From Contracts With Customers	$ 13,911	$ 62,631

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. [Refer: Revenue]

+ References

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