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Flow-through share premium liability - Additional Information (Detail) $ in Thousands | Dec. 31, 2023 CAD ($)
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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: |