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Significant Accounting Policies - Summary of Company's Ownership Percentage in Each of Its Subsidiaries (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
NXE Energy Royalty Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%
NXE Energy SW1 Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%
NXE Energy SW3 Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%
IsoEnergy Ltd. [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	53.35%	63.90%

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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

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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2018-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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