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Financial risk management and financial instruments - Financing Risk (Details)	12 Months Ended
	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

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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