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Trade and other receivables - Collateral and other (Details) R in Millions | Jun. 30, 2021 ZAR (R) customer | Jun. 30, 2020 customer | Jun. 30, 2019 customer
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Trade and other receivables |  |  |
Number of customers representing more than ten percent of trade receivables | customer | 0 | 0 | 0
Collateral held over trade receivables | R | R 0 |  |

X
- Definition The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 15 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_15_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_AssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Number of customers representing more than ten percent of trade receivables + References No definition available. + Details
Name: | ssl_NumberOfCustomersRepresentingMoreThanTenPercentOfTradeReceivables
Namespace Prefix: | ssl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant