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v3.19.3

Related Parties - Disclosure of Transactions with Related Parties (Details) - ZAR (R) R in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Disclosure of transactions between related parties [line items] |  |
Sales and services rendered to related parties | R 3 | R 11
Purchases and services acquired from related parties | 44 | 47
Joint operations |  |
Disclosure of transactions between related parties [line items] |  |
Sales and services rendered to related parties | 3 | 11
Directors |  |
Disclosure of transactions between related parties [line items] |  |
Purchases and services acquired from related parties | 4 | 6
Associates |  |
Disclosure of transactions between related parties [line items] |  |
Purchases and services acquired from related parties | R 40 | R 41

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- Definition Purchases Of Goods And Services Received, Related Party Transactions + References No definition available. + Details
Name: | hmy_PurchasesOfGoodsAndServicesReceivedRelatedPartyTransactions
Namespace Prefix: | hmy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Revenue From Sale Of Goods And Rendering Of Services, Related Party Transactions + References No definition available. + Details
Name: | hmy_RevenueFromSaleOfGoodsAndRenderingOfServicesRelatedPartyTransactions
Namespace Prefix: | hmy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_JointControlOrSignificantInfluenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=hmy_Director1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_AssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |