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Flow-through share premium liability - Additional Information (Detail) $ in Thousands	Dec. 31, 2023 CAD ($)
IsoEnergy Ltd. [member]
Commitments [line items]
Required exploration expenditures	$ 4,919

X

- Definition

Line items representing commitments.

+ References

No definition available.

+ Details

Name:	nxe_CommitmentsLineItems
Namespace Prefix:	nxe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Required exploration expenditures.

+ References

No definition available.

+ Details

Name:	nxe_RequiredExplorationExpenditures
Namespace Prefix:	nxe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=nxe_IsoenergyLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: