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Loss (Profit) Per Share - Additional Information (Detail) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Earnings per share [abstract] |  |
Options exclued from diluted weighted-average number of common shares become anti-dilutive | 16,350,000 | 0

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- References No definition available. + Details
Name: | ifrs-full_EarningsPerShareAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Dilutive shares with anti dilutive effect not included in calculation of diluted earnings per share. + References No definition available. + Details
Name: | nxe_DilutiveSharesWithAntiDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShare
Namespace Prefix: | nxe_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration