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Investment in Joint Operations (Details) - Wafi-Golpu joint operation | 12 Months Ended
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Jun. 30, 2019
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation (as a percent) | 50.00%
Newcrest Mining Limited |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation (as a percent) | 50.00%

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

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- Definition The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInJointOperation
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_JointOperationsAxis=hmy_WafiGolpuJointOperationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=hmy_NewcrestMiningLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |