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Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021
Disclosure of significant accounting policies [line items]
Flow through shares expended on property exploration period	two years

X

- Definition

Disclosure of significant accounting policies [line items]

+ References

No definition available.

+ Details

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

X

- Definition

Flow through shares expended on property exploration period.

+ References

No definition available.

+ Details

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