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Long-term debt - Fair Value (Details) - Long-term debt - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Long-term debt
Total long-term debt (before unamortised loan costs)	R 109,984	R 82,261
Minimum
Long-term debt
Interest rate (as a percent)	1.20%
Maximum
Long-term debt
Interest rate (as a percent)	13.30%

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The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

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