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Cash-settled share-based payment provision - Sasol Share Appreciation Rights Scheme (Details) - Share Appreciation Right (SARs) | 12 Months Ended |
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Jun. 30, 2018 item shares | Jun. 30, 2017 item
Share-based payment transaction |  |
Number of rights granted in cash settled arrangement | item | 7,118,321 | 11,401,116
Number of shares issued under the plan | shares | 0 |
Number of months in which estate of deceased employee can exercise the rights | 12 months |
Number of months in which employee can exercise the rights on retrenchment or retirement | 12 months |
Number of days after publication of the results of price sensitive information in which the employees have to wait to deal with the company's equity securities | 2 days |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of cash settled instruments outstanding in cash settled scheme payment arrangement. + References No definition available. + Details
Name: | ssl_NumberOfCashSettledInstrumentsOutstandingInCashSettledSchemePaymentArrangement
Namespace Prefix: | ssl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of days after publication of the results of price sensitive information in which the employees have to wait to deal with the company's equity securities including Share Appreciation Rights (SARs). + References No definition available. + Details
Name: | ssl_NumberOfDaysAfterPublicationOfPriceSensitiveInformationEmployeesHaveToWaitToDealWithCompanyEquitySecurities
Namespace Prefix: | ssl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period for employee on retrenchment or retirement to exercise the rights under share based payment arrangements, in 'PnYnMnDTnHnMnS' format. + References No definition available. + Details
Name: | ssl_PeriodForEmployeeOnRetrenchmentOrRetirementToExerciseRightsUnderShareBasedPaymentArrangements
Namespace Prefix: | ssl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period for estate of deceased employee to exercise the rights under share based payment arrangements, in 'PnYnMnDTnHnMnS' format. + References No definition available. + Details
Name: | ssl_PeriodForEstateOfDeceasedEmployeeToExerciseRightsUnderShareBasedPaymentArrangements
Namespace Prefix: | ssl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of share instruments newly issued and to-date issued under a share-based compensation plan. + References No definition available. + Details
Name: | ssl_ShareBasedCompensationArrangementsByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix: | ssl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ssl_StockAppreciationRightSarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |