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Acquisitions and Business Combinations - Narrative (Details) R in Millions | 12 Months Ended | 16 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 ZAR (R) K / $ | Jun. 30, 2018 ZAR (R) K / $ | Jun. 30, 2017 ZAR (R) K / $ | Oct. 25, 2016 ZAR (R) | Jun. 30, 2018 USD ($) K / $ | Mar. 01, 2018 R / $ $ / lb $ / oz | Oct. 26, 2016 ZAR (R) | Oct. 25, 2016 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Acquisition related costs | R 0 | R 98 | R 0 |  |  |  |  |
Foreign exchange rate assumption | K / $ | 3.34 | 3.17 | 3.16 |  | 3.17 |  |  |
Gain on bargain purchase | R 0 | R 0 | R 848 |  |  |  |  |
HVJV |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  |  |  | 50.00% |  |  |  |
Newcrest PNG 1 Ltd |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  |  |  | 50.00% |  |  |  |
Interest acquired (as a percent) |  |  |  | 50.00% |  |  |  | 50.00%
Moab Khotsong |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Consideration paid | 0 | 3,474 |  |  | $ 300,000,000 |  |  |
Acquisition related costs |  | 98 |  |  |  |  |  |
Business integration expense | 8 | 63 |  |  |  |  |  |
Fair value of net identifiable assets acquired | R 0 | 3,172 |  |  |  |  |  |
Moab Khotsong | Bottom of range |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  | 8.20% |  |
Foreign exchange rate assumption | R / $ |  |  |  |  |  | 11.86 |  |
Gold price assumption | $ / oz |  |  |  |  |  | 1,249 |  |
Uranium price assumption | $ / lb |  |  |  |  |  | 30.44 |  |
Moab Khotsong | Top of range |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  | 11.30% |  |
Foreign exchange rate assumption | R / $ |  |  |  |  |  | 15.82 |  |
Gold price assumption | $ / oz |  |  |  |  |  | 1,302 |  |
Uranium price assumption | $ / lb |  |  |  |  |  | 37.47 |  |
Newcrest PNG 1 Ltd |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Consideration paid | $ |  |  |  |  |  |  |  | $ 1
Once off contribution |  |  |  | R 309 |  |  |  | $ 22,500,000
Fair value of net identifiable assets acquired |  |  |  |  |  |  | R 848 |
Hidden Valley |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Gain on bargain purchase |  |  | R 848 |  |  |  |  |
Property, plant and equipment | Moab Khotsong |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Measurement period adjustment |  | R 32 |  |  |  |  |  |

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- Definition The amount of acquisition-related costs recognised as an expense for transactions that are recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph m -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_m&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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