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Employee Benefits - Narrative (Details) - ZAR (R) R in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Employee Benefits [Abstract] |  |
Termination costs | R 248 | R 216

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- Definition Employee Benefits [Abstract] + References No definition available. + Details
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Namespace Prefix: | hmy_
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Balance Type: | na
Period Type: | duration

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- Definition The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 171 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_171&doctype=Standard -URIDate 2018-03-16 + Details
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