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Financial Risk Management - Fair Value Determination for Financial Assets and Liabilities (Details) - ZAR (R) R in Millions | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
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Disclosure of fair value measurement of assets [line items] |  |  |
Assets | R 36,736 | R 39,521 | R 38,883
Financial assets at fair value through other comprehensive income | Other non-current assets | Level 2 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Assets | 0 | 0 |
Financial assets at fair value through other comprehensive income | Other non-current assets | Level 3 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Assets | 59 | 8 |
Financial assets at fair value through profit or loss | Other non-current assets | Level 2 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Assets | 0 | 0 |
Financial assets at fair value through profit or loss | Other non-current assets | Level 3 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Assets | 271 | 0 |
Financial assets at fair value through profit or loss | Restricted investments | Level 2 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Assets | 1,256 | 913 |
Financial assets at fair value through profit or loss | Restricted investments | Level 3 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Assets | 0 | 0 |
Financial assets at fair value through profit or loss | Derivative financial instruments | Level 2 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Assets | 507 | 623 |
Financial assets at fair value through profit or loss | Derivative financial instruments | Level 3 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Assets | 0 | 0 |
Financial liabilities at fair value through profit or loss | Derivative financial instruments | Level 2 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Liabilities | (422) | (215) |
Financial liabilities at fair value through profit or loss | Derivative financial instruments | Level 3 |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Liabilities | R 0 | R 0 |

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- Definition The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_c&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_a&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_b&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23&doctype=Standard -URIDate 2018-03-16 + Details
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