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Taxation - Reconciliation of effective tax rate (Details) - ZAR (R) R in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Reconciliation of average effective tax rate and applicable tax rate |  |  |
South African normal tax rate | 28.00% | 28.00% | 28.00%
Increase in rate of tax due to - disallowed preference share dividends | 0.30% | 0.90% | 0.90%
Increase in rate of tax due to - disallowed expenditure | 9.40% | 4.20% | 2.30%
Increase in rate of tax due to - disallowed share-based payment expenses | 2.90% | 5.30% | 0.10%
Increase in rate of tax due to - different tax rates | 13.20% | 2.60% | 0.30%
Increase in rate of tax due to - effect of tax litigation matters |  |  | 3.20%
Increase in rate of tax due to - tax losses not recognised | 8.60% | 9.30% | 1.00%
Increase in rate of tax due to - prior year adjustments | 2.00% | 0.40% |
Increase in rate of tax due to - other adjustments | 2.00% | 1.50% | 0.40%
Normal tax rate plus increase in tax rate | 66.40% | 52.20% | 36.20%
Decrease in rate of tax due to - exempt income | (1.70%) | (4.20%) | (0.40%)
Decrease in rate of tax due to - share of profits of equity accounted investments | (3.30%) | (2.60%) | (1.00%)
Decrease in rate of tax due to - effect of tax litigation matters | (8.20%) |  |
Decrease in rate of tax due to - recognition of previously unrecognised deferred tax assets |  |  | (1.60%)
Decrease in rate of tax due to - utilisation of tax losses | (0.30%) | (0.40%) |
Decrease in rate of tax due to - investment incentive allowances | (17.20%) | (6.90%) | (2.40%)
Decrease in rate of tax due to - effect of tax rate change in the US |  | (1.40%) |
Decrease in rate of tax due to - translation differences | (0.90%) | (0.90%) | (0.90%)
Decrease in rate of tax due to - prior year adjustments |  |  | (1.40%)
Decrease in rate of tax due to - other adjustments | (0.60%) | (0.40%) | (0.20%)
Effective tax rate | 34.20% | 35.40% | 28.30%
Adjusted effective tax rate | 29.60% | 27.30% | 26.50%
Increase in energy efficiency allowance | R 4,200 |  |
Canadian shale gas asset |  |  |
Reconciliation of average effective tax rate and applicable tax rate |  |  |
Impairment loss | 1,900 | R 2,800 |
Deferred tax asset raised on impairment loss | R 0 | 0 |
Mozambique PSA |  |  |
Reconciliation of average effective tax rate and applicable tax rate |  |  |
Impairment loss |  | 1,100 |
Deferred tax asset raised on impairment loss |  | R 0 |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The tax expense (income) divided by the accounting profit. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from a change in tax rate. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from adjustments for the current tax of prior periods. [Refer: Average effective tax rate; Applicable tax rate; Adjustments for current tax of prior periods] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the expenses not deductible in determining taxable profit. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the application of foreign tax rates. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from revenue that is exempt from taxation. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The adjusted tax expense (income) divided by the accounting profit. + References No definition available. + Details
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- Definition The applicable tax rate plus increase in tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate. + References No definition available. + Details
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