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Nature of Operations - Additional Information (Detail) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Nature of operations [abstract]
Accumulated deficit	$ (304,004)	$ (389,867)
Working capital	$ 279,053

X

- Definition

A component of equity representing the entity's cumulative undistributed earnings or deficit.

+ References

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-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Nature of operations.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Working capital.

+ References

No definition available.

+ Details

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Namespace Prefix:	nxe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant