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Post-retirement benefit obligations - Investments (Details) - Pension - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024
South Africa
Pension benefits
Percentage of members electing to transfer to the defined contribution section of the pension fund	99.00%
Ordinary shares included in the plan assets		2,080,908		2,080,048
Value of ordinary shares included in the plan assets		R 160		R 287
Value of property occupied included in the plan assets		R 1,589		R 1,533
Pension fund assets
Equities	55.00%		52.00%
Resources	6.00%		7.00%
Industrials	4.00%		3.00%
Consumer discretionary	11.00%		9.00%
Consumer staples	6.00%		7.00%
Healthcare	4.00%		4.00%
Information technologies	7.00%		7.00%
Telecommunications	3.00%		3.00%
Utilities	1.00%		1.00%
Financials (ex real estate)	13.00%		11.00%
Fixed interest	17.00%		20.00%
Direct property	11.00%		10.00%
Listed property	3.00%		3.00%
Cash and cash equivalents	4.00%		2.00%
Third party managed assets	9.00%		12.00%
Other	1.00%		1.00%
Total	100.00%		100.00%
United States of America
Pension fund assets
Equities	33.00%		28.00%
Resources	3.00%		3.00%
Industrials	4.00%		3.00%
Consumer discretionary	4.00%		4.00%
Consumer staples	3.00%		2.00%
Healthcare	3.00%		3.00%
Information technologies	8.00%		7.00%
Telecommunications	3.00%		2.00%
Financials (ex real estate)	5.00%		4.00%
Fixed interest	42.00%		45.00%
Direct property	7.00%		8.00%
Other	18.00%		19.00%
Total	100.00%		100.00%

X

- Definition

The percentage cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Cash and cash equivalents, amount contributed to fair value of plan assets]

+ References

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- 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; Classes of financial instruments [domain]; Defined benefit plans [domain]]

+ References

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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 [domain]]

+ References

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- Definition

The percentage equity instruments contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Equity instruments, amount contributed to fair value of plan assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The percentage other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Other assets, amount contributed to fair value of plan assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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- Definition

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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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

The percentage that utilities 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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- Definition

The percentage of Defined Contribution Plan members who have elected to transfer to the defined contribution section

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- Definition

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

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- Definition

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

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