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]]

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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]]

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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]]

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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.

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The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
-Paragraph 147
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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

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement health care plan.

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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
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