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CONSOLIDATED STATEMENTS OF LOSS (PROFIT) AND OTHER COMPREHENSIVE LOSS (PROFIT) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Profit or loss [abstract] |  |
Salaries, benefits and directors' fees | $ 5,897,494 | $ 3,993,277
Office and administrative | 1,855,177 | 1,502,988
Professional fees | 2,003,931 | 1,725,921
Travel | 920,834 | 639,559
Depreciation | 1,533,634 | 758,063
Share-based payments | 13,736,299 | 9,183,667
Impairment of exploration and evaluation assets |  | 87,749
Finance income | (2,486,565) | (1,305,784)
Mark to market loss (gain) on convertible debentures | (32,578,261) | 27,522,985
Convertible debenture issuance costs |  | 2,811,146
Interest expense | 11,954,146 | 8,693,847
Foreign exchange loss (gain) | (4,025,062) | 1,225,599
Loss on disposal of equipment | 6,065 | 24,905
Loss (profit) from operations | (1,182,308) | 56,863,922
Deferred income tax recovery | (309,298) | (33,312)
Change in fair value of convertible debentures attributable to the change in credit risk | (600,821) |
Shareholders of NexGen Energy Ltd. | (2,870,510) | 56,038,329
Non-controlling interests in IsoEnergy Ltd. | 778,083 | 792,281
Loss (profit) attributable to: |  |
Shareholders of NexGen Energy Ltd. | (2,269,689) | 56,038,329
Non-controlling interests in IsoEnergy Ltd. | 778,083 | 792,281
Loss (profit) for the year | (1,491,606) | 56,830,610
Total comprehensive loss (profit) attributable to: |  |
Total comprehensive loss (profit) for the year | $ (2,092,427) | $ 56,830,610
Loss (profit) per common share attributable to the Company's common shareholders |  |
Basic loss (profit) per common share | $ (0.01) | $ 0.17
Diluted loss (profit) per common share | $ 0.06 | $ 0.17
Weighted average number of common shares outstanding |  |
Basic | 345,868,725 | 321,921,938
Diluted | 413,384,053 | 321,921,938

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- Definition Convertible debenture issuance costs. + References No definition available. + Details
Name: | nxe_ConvertibleDebentureIssuanceCosts
Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Impairment loss reversal of impairment loss recognised in profit or loss exploration and evaluation assets. + References No definition available. + Details
Name: | nxe_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossExplorationAndEvaluationAssets
Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Mark to market loss (gain) on convertible debentures. + References No definition available. + Details
Name: | nxe_MarkToMarketGainLossOnConvertibleDebentures
Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration