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Flow-through share premium liability - Summary of Continuity of the Flow-through Share Premium Liability (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
FLOWTHROUGH SHARE PREMIUM LIABILITY [Abstract]
Balance, beginning of the year	$ 2,069	$ 0
Liability incurred on flow-through shares issued	0	2,115
Settlement of flow-though share liability on expenditures	(2,069)	(46)
Balance, end of the year	$ 0	$ 2,069

X

- 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

X

- Definition

Commitments

+ References

No definition available.

+ Details

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

X

- Definition

Liability incurred on flow-through shares issued.

+ References

No definition available.

+ Details

Name:	nxe_LiabilityIncurredOnFlowthroughSharesIssued
Namespace Prefix:	nxe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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