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Commitments under leases- Operating (Details) - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Commitments under leases
Minimum future lease payments	R 26,091	R 21,373
Property, plant and equipment
Commitments under leases
Minimum future lease payments	23,275	18,414
Property, plant and equipment | Within one year
Commitments under leases
Minimum future lease payments	2,068	1,316
Property, plant and equipment | One to five years
Commitments under leases
Minimum future lease payments	5,863	4,009
Property, plant and equipment | More than five years
Commitments under leases
Minimum future lease payments	R 15,344	13,089
Corporate office building
Commitments under leases
Lease contract term (in years)	20 years
Lease renewal term (in years)	5 years
Pipeline
Commitments under leases
Lease contract term (in years)	16 years
Lease renewal term (in years)	3 years
Water Supply Agreement
Commitments under leases
Minimum future lease payments	R 2,816	2,959
Lease contract term (in years)	20 years
Water Supply Agreement | Within one year
Commitments under leases
Minimum future lease payments	R 171	144
Water Supply Agreement | One to five years
Commitments under leases
Minimum future lease payments	847	777
Water Supply Agreement | More than five years
Commitments under leases
Minimum future lease payments	R 1,798	R 2,038

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- Definition

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No definition available.

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- Definition

The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 35
-Subparagraph a
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-URIDate 2017-03-09

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- Definition

Term of the lessee's leasing arrangement renewal.

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- Definition

Term of the lessee's leasing arrangement.

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