v3.26.3

Employee Benefits - Narrative (Details) - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Employee Benefits [Abstract]
Termination costs	R 188	R 219

X

- Definition

Employee Benefits [Abstract]

+ References

No definition available.

+ Details

Name:	hmy_EmployeeBenefitsAbstract
Namespace Prefix:	hmy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 171
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_171&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_TerminationBenefitsExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration