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Accounts Payable and Accrued Liabilities (Details) $ in Millions | Dec. 31, 2022 CAD ($)
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Disclosure Of Accrued Expenses And Other Liabilities Text Block Abstract |
Non-trade payables and accrued expenses | $ 26.3

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- Definition The non-current amount of payment due to suppliers for goods and services used in the entity's business. [Refer: Trade payables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_NoncurrentPayablesToTradeSuppliers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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