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Net finance costs - Finance costs (Details) - ZAR (R) R in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing costs incurred before amortisation of loan costs and notional interest | R 5,903 | R 4,916 | R 3,779
Amortisation of loan costs | 462 | 279 | 157
Notional interest | 962 | 834 | 657
Total finance costs | 7,327 | 6,029 | 4,593
Amounts capitalised to assets under construction | (3,568) | (2,764) | (2,253)
Finance costs per income statement | 3,759 | 3,265 | 2,340
Total finance costs before amortisation of loan costs and notional interest | 5,903 | 4,916 | 3,779
Less: interest accrued on long-term debt | (878) | (956) | (530)
Less: interest accrued on tax payable | (228) | (348) |
Finance costs per the statement of cash flows | 4,797 | 3,612 | 3,249
Debt and interest rate swap |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing costs incurred before amortisation of loan costs and notional interest | 4,166 | 3,463 | 2,696
Total finance costs before amortisation of loan costs and notional interest | 4,166 | 3,463 | 2,696
Secured and unsecured debt |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing costs incurred before amortisation of loan costs and notional interest | 3,880 | 3,162 | 2,599
Total finance costs before amortisation of loan costs and notional interest | 3,880 | 3,162 | 2,599
Interest rate swap |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing costs incurred before amortisation of loan costs and notional interest | 286 | 301 | 97
Total finance costs before amortisation of loan costs and notional interest | 286 | 301 | 97
Preference shares |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing costs incurred before amortisation of loan costs and notional interest | 963 | 989 | 981
Total finance costs before amortisation of loan costs and notional interest | 963 | 989 | 981
Finance leases |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing costs incurred before amortisation of loan costs and notional interest | 483 | 86 | 76
Total finance costs before amortisation of loan costs and notional interest | 483 | 86 | 76
Other |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing costs incurred before amortisation of loan costs and notional interest | 291 | 378 | 26
Total finance costs before amortisation of loan costs and notional interest | R 291 | R 378 | R 26

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2017-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2017-03-01&anchor=para_26_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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