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v3.19.3

Taxation - Dividend Tax (Details) | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Income Taxes [Abstract] |  |  |
Withholding tax | 20.00% | 20.00% | 20.00%

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- Definition Income Taxes [Abstract] + References No definition available. + Details
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Namespace Prefix: | hmy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Withholding Tax, Percent + References No definition available. + Details
Name: | hmy_WithholdingTaxPercent
Namespace Prefix: | hmy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration