Trade and other receivables - Collateral and other (Details) R in Millions	Jun. 30, 2020 ZAR (R) customer	Jun. 30, 2019 customer	Jun. 30, 2018 customer
Trade and other receivables
Number of customers representing more than ten percent of trade receivables \| customer	0	0	0
Collateral held over trade receivables \| R	R 0

The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 15
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_15_a&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_AssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant