XML 251 R152.htm IDEA: XBRL DOCUMENT
v3.19.3

Provision for Silicosis Settlement - Narrative (Details) - Provision raised for settlement - ZAR (R) R in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of other provisions [line items] |  |  |
Discount rates | 8.50% | 8.50% | 8.00%
Change in estimate | R 62 | R 68 |
Nominal amount | R 1,300 |  |

X
- Definition Increase (Decrease) Through Transfers And Other Changes, Change In Estimate + References No definition available. + Details
Name: | hmy_IncreaseDecreaseThroughTransfersAndOtherChangesChangeInEstimate
Namespace Prefix: | hmy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Major Assumptions Made Concerning Future Events, Other Provisions, Discount Rate + References No definition available. + Details
Name: | hmy_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsDiscountRate
Namespace Prefix: | hmy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Provisions, Nominal Amount + References No definition available. + Details
Name: | hmy_ProvisionsNominalAmount
Namespace Prefix: | hmy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfOtherProvisionsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=ifrs-full_LegalProceedingsProvisionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |