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Post-retirement benefit obligations - Investments (Details) - Pension - ZAR (R) R in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Mar. 31, 2017
South Africa |  |  |  |
Pension benefits |  |  |  |
Percentage of members electing to transfer to the defined benefit plan | 99.00% |  |  |
Ordinary shares included in the plan assets |  | 1,678,808 |  | 2,253,108
Value of ordinary shares included in the plan assets |  | R 844 |  | R 826
Value of property occupied included in the plan assets |  | R 1,543 |  |
Pension fund assets |  |  |  |
Equities | 53.00% |  | 53.00% |
Resources | 6.00% |  | 5.00% |
Industrials | 3.00% |  | 2.00% |
Consumer discretionary | 12.00% |  | 14.00% |
Consumer staples | 12.00% |  | 13.00% |
Healthcare | 3.00% |  | 4.00% |
Information technologies | 4.00% |  | 3.00% |
Telecommunications | 1.00% |  | 2.00% |
Financials ex real estate | 12.00% |  | 10.00% |
Fixed interest | 10.00% |  | 10.00% |
Direct property | 17.00% |  | 16.00% |
Listed property | 5.00% |  | 7.00% |
Cash and cash equivalents | 4.00% |  | 3.00% |
Third party managed assets | 11.00% |  | 11.00% |
Total | 100.00% |  | 100.00% |
United States of America |  |  |  |
Pension fund assets |  |  |  |
Equities | 32.00% |  | 44.00% |
Resources | 5.00% |  | 7.00% |
Industrials | 3.00% |  | 5.00% |
Consumer discretionary | 4.00% |  | 5.00% |
Consumer staples | 2.00% |  | 3.00% |
Healthcare | 3.00% |  | 5.00% |
Information technologies | 7.00% |  | 9.00% |
Telecommunications | 2.00% |  | 2.00% |
Financials ex real estate | 6.00% |  | 8.00% |
Fixed interest | 59.00% |  | 44.00% |
Direct property | 5.00% |  | 7.00% |
Other | 4.00% |  | 5.00% |
Total | 100.00% |  | 100.00% |

X
- Definition The fair value of the entity's own transferable financial instruments that are included in the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Financial instruments, class [member]; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 143 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_143&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The fair value of property occupied by the entity that are included in the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 143 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_143&doctype=Standard -URIDate 2017-03-09 + Details
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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 percentage that Cash and cash equivalents constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that Direct property investments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that consumer discretionary equity instruments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that consumer staples equity instruments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that financials excluding real estate equity instruments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that healthcare equity instruments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that industrials equity instruments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that information technologies equity instruments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that instruments representing equity (rather than debt) constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that resource equity instruments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that telecommunications equity instruments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that Fixed interest investments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that Listed property investments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The number of shares of the entity's own transferable financial instruments that are included in the defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage that Other investments constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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- Definition The percentage of Defined Contribution Plan members who have elected to transfer to the Defined Benefit Plan. + References No definition available. + Details
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- Definition The percentage that Third party managed assets constitute of the fair value of defined benefit plan assets. + References No definition available. + Details
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