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Related Party Transactions - Schedule of Amounts Due to Related Parties, Included in Trade Payables and Accrued Liabilities (Details) - CAD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Disclosure of transactions between related parties [line items] |  |
Amounts due to related party | $ 113 | $ 169
Amount due from related party |  | 95
Investment in related party | 163 | 24
Directors and Officers [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Amounts due to related party | 27 | 38
Related Companies [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Amounts due to related party | $ 86 | $ 131

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- Definition The amount of receivables due from related parties. [Refer: Related parties [member]] + References No definition available. + Details
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Namespace Prefix: | WSCRF_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2020-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2020-en-r&anchor=para_10&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of current payables due to related parties. [Refer: Related parties [member]; Payables to related parties] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=WSCRF_DirectorsAndOfficersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=WSCRF_RelatedCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |