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v3.23.1

Cash and Cash Equivalents and Short-Term Deposits (Details) $ in Thousands, $ in Millions | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($)
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Disclosure Of Cash And Cash Equivalents Text Block Abstract |  |  |
Short-term deposits | $ 81,690 | $ 80.4 | $ 29,243

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- Definition A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard -URIDate 2022-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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