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Commitments - Summary of Continuity of the Flow-through Share Premium Liability (Detail) - CAD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Commitments [abstract] |  |
Balance, beginning of the period | $ 109,251 | $ 179,212
Liability incurred on flow-through shares issued | 784,892 | 130,000
Settlement of flow-through share premium liability on expenditures made | (343,751) | (199,961)
Balance, end of the period | $ 550,392 | $ 109,251

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- Definition Commitments + References No definition available. + Details
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Namespace Prefix: | nxe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The liability amount that will be reduced when the entity makes expenditures for qualified Canadian exploration expenditures (CEE) within a certain time period. This is a current liability if required CEE must be made within the year; otherwise this is a long-term liability. + References No definition available. + Details
Name: | nxe_FlowThroughSharePremiumLiability
Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Liability incurred on flow-through shares issued. + References No definition available. + Details
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Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
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- Definition Settlement of flow-through share premium liability on expenditures made. + References No definition available. + Details
Name: | nxe_SettlementOfFlowthroughSharePremiumLiabilityOnExpendituresMade
Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration