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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
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-IssueDate 2017-01-01
-Paragraph 143
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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
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- Definition

The percentage that Cash and cash equivalents constitute of the fair value of defined benefit plan assets.

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- Definition

The percentage that Direct property investments constitute of the fair value of defined benefit plan assets.

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- Definition

The percentage that consumer discretionary equity instruments constitute of the fair value of defined benefit plan assets.

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The percentage that consumer staples equity instruments constitute of the fair value of defined benefit plan assets.

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- Definition

The percentage that financials excluding real estate equity instruments constitute of the fair value of defined benefit plan assets.

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The percentage that healthcare equity instruments constitute of the fair value of defined benefit plan assets.

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The percentage that industrials equity instruments constitute of the fair value of defined benefit plan assets.

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The percentage that information technologies equity instruments constitute of the fair value of defined benefit plan assets.

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The percentage that instruments representing equity (rather than debt) constitute of the fair value of defined benefit plan assets.

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The percentage that resource equity instruments constitute of the fair value of defined benefit plan assets.

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The percentage that telecommunications equity instruments constitute of the fair value of defined benefit plan assets.

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- Definition

The percentage that Fixed interest investments constitute of the fair value of defined benefit plan assets.

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- Definition

The percentage that Listed property investments constitute of the fair value of defined benefit plan assets.

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The number of shares of the entity's own transferable financial instruments that are included in the defined benefit plan assets.

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The percentage that Other investments constitute of the fair value of defined benefit plan assets.

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- Definition

The percentage of Defined Contribution Plan members who have elected to transfer to the Defined Benefit Plan.

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The percentage that specified investments constitute of the fair value of defined benefit plan assets.

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The percentage that Third party managed assets constitute of the fair value of defined benefit plan assets.

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