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Financial risk management and financial instruments - Income Statement Impact (Details) - ZAR (R) R in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Financial risk management and financial instruments |  |  |
Net (loss)/gain on derivative instruments | R (3,876) | R 649 | R 1,265
Foreign exchange contracts |  |  |
Financial risk management and financial instruments |  |  |
Net (loss)/gain on derivative instruments | 121 | (1,107) | 920
Crude oil options |  |  |
Financial risk management and financial instruments |  |  |
Net (loss)/gain on derivative instruments | (3,303) | (237) |
Zero cost collar |  |  |
Financial risk management and financial instruments |  |  |
Net (loss)/gain on derivative instruments | 936 | 1,608 |
Crude oil futures |  |  |
Financial risk management and financial instruments |  |  |
Net (loss)/gain on derivative instruments | (687) | 277 | 330
Coal swaps |  |  |
Financial risk management and financial instruments |  |  |
Net (loss)/gain on derivative instruments | (1,024) | 94 |
Ethane swaps |  |  |
Financial risk management and financial instruments |  |  |
Net (loss)/gain on derivative instruments | 29 |  |
Interest rate swap |  |  |
Financial risk management and financial instruments |  |  |
Net (loss)/gain on derivative instruments | R 52 | R 14 | R 15

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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. + References No definition available. + Details
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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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