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Post-retirement benefit obligations - Actuarial Assumptions (Details) - Y	12 Months Ended
	Apr. 30, 2018	Mar. 31, 2018	Apr. 30, 2017	Mar. 31, 2017
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		4.50%		5.20%
Average salary increases		5.50%		5.50%
South Africa | Pension
Post-retirement benefit obligations
Discount rate		9.90%		10.10%
Weighted average duration of the obligation		13		13
South Africa | Healthcare
Post-retirement benefit obligations
Discount rate		9.90%		9.80%
Weighted average duration of the obligation		15		15
United States of America
Post-retirement benefit obligations
Medical cost trend rate - initial	7.00%		7.00%
Medical cost trend rate - ultimate	5.50%		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		14
United States of America | Healthcare
Post-retirement benefit obligations
Discount rate	3.90%		3.50%
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	1.80%		1.90%
Weighted average duration of the obligation	17		18

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
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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
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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

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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
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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.

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

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