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Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 Segment
Disclosure Of Segment Information [abstract]
Number of reportable segment	1

X

- Definition

Disclosure of segment information.

+ References

No definition available.

+ Details

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

X

- Definition

Number of reportable segment.

+ References

No definition available.

+ Details

Name:	nxe_NumberOfReportableSegment
Namespace Prefix:	nxe_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration