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Financial risk management and financial instruments - Financing Risk (Details) | 12 Months Ended
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Jun. 30, 2018
Financial risk management and financial instruments |
Target minimum average time to maturity for long-term borrowings | 2 years

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

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- Definition The entity's targeted minimum period for the average time to maturity of long-term borrowings. + References No definition available. + Details
Name: | ssl_LongTermBorrowingsTargetMinimumAverageTimeToMaturity
Namespace Prefix: | ssl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration