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Basis of Preparation (Details) | 12 Months Ended
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Dec. 31, 2022
Disclosure Of Interim Financial Reporting Text Block Abstract |
Voting rights, description | Significant influence is presumed to exist where the Company has between 20% and 50% of the voting rights but can also arise where the Company has less than 20% if influence is exerted over policy decisions that affect the entity.

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

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- Definition Voting rights, description. + References No definition available. + Details
Name: | sa_VotingRightsDescription
Namespace Prefix: | sa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration