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Share capital - Shares Issued Roll Forward (Details) - shares | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Reconciliation of number of shares outstanding |  |  |
Shares issued at beginning of year | 640,667,612 | 635,676,817 | 634,244,336
Issued in terms of employee share schemes | 7,807,492 | 4,990,795 | 1,432,481
Shares issued at end of year | 648,475,104 | 640,667,612 | 635,676,817

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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NumberOfSharesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

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- Definition The number of shares issued in terms of employee share schemes during the period. + References No definition available. + Details
Name: | ssl_SharesIssuedInTermsOfEmployeeShareSchemes
Namespace Prefix: | ssl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration