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Financial risk management and financial instruments - Credit Risk (Details) - customer	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Credit risk
Number of customers representing more than ten percent of turnover	0	0	0
Number of customers representing more than ten percent of trade receivables	0	0	0
South Africa
Credit risk
Percentage of total turnover	49.00%	48.00%	47.00%
Europe
Credit risk
Percentage of total turnover	24.00%	22.00%	23.00%
United States of America
Credit risk
Percentage of total turnover	13.00%	13.00%	14.00%

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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.

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- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-IssueDate 2017-01-01
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- Definition

Number of customers representing more than ten percent of trade receivables

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Number of customers representing more than ten percent of turnover

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