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Leases - Additional Information (Detail) - CAD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 05, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Statement [LineItems] |  |  |
Undiscounted operating lease payments |  | $ 1,476 | $ 2,952
Purchase of property plant and equipment classified as investing activities |  | $ 2,361 | $ 6,066
Purchase Agreement For Finance Lease Receivable [Member] |  |  |
Statement [LineItems] |  |  |
Purchase of property plant and equipment classified as investing activities | $ 4,100 |  |

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- Definition The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16_a&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Statement1 + References No definition available. + Details
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Namespace Prefix: | nxe_
Data Type: | xbrli:stringItemType
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- Definition Undiscounted operating lease payments. + References No definition available. + Details
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Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |