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Post-retirement benefit obligations - Actuarial Assumptions (Details) - Y | Jun. 30, 2019 | Apr. 01, 2019 | Mar. 31, 2019 | Apr. 30, 2018 | Mar. 31, 2018
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South Africa |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |
Medical cost trend rate - initial |  |  | 7.50% |  | 7.50%
Medical cost trend rate - ultimate |  |  | 7.50% |  | 7.50%
Pension increase assumption |  |  | 4.70% |  | 4.50%
Average salary increases |  |  | 5.50% |  | 5.50%
South Africa | Pension |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |
Discount rate |  |  | 10.00% |  | 9.90%
Weighted average duration of the obligation |  |  | 13 |  | 13
South Africa | Healthcare |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |
Discount rate |  |  | 10.50% |  | 9.90%
Weighted average duration of the obligation |  |  | 15 |  | 15
United States of America |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |
Medical cost trend rate - initial | 8.50% |  |  | 7.00% |
Medical cost trend rate - ultimate | 4.50% |  |  | 5.50% |
Average salary increases | 4.20% |  |  | 4.20% |
United States of America | Pension |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |
Discount rate | 2.70% |  |  | 2.70% |
Weighted average duration of the obligation | 13 |  |  | 13 |
United States of America | Healthcare |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |
Discount rate | 3.60% |  |  | 3.90% |
Weighted average duration of the obligation | 9 |  |  | 9 |
Europe |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |
Pension increase assumption |  | 1.80% |  | 1.80% |
Average salary increases |  | 2.80% |  | 2.80% |
Europe | Pension |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |
Discount rate |  | 1.60% |  | 1.80% |
Weighted average duration of the obligation |  | 18 |  | 17 |

X
- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + 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 weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_147_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. + References No definition available. + Details
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