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Post employment benefits - Weighted average assumptions used to determine group's deficit/surplus in main post employment plans (Details)	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
United Kingdom
Disclosure of defined benefit plans [line items]
Rate of general increase in salaries	3.60%	3.70%	3.60%
Rate of increase to pensions in payment	2.80%	2.90%	2.90%
Rate of increase to deferred pensions	2.60%	2.70%	2.60%
Discount rate for plan liabilities	5.10%	5.20%	3.80%
United Kingdom | CPI
Disclosure of defined benefit plans [line items]
Inflation	2.60%	2.70%	2.60%
United Kingdom | RPI
Disclosure of defined benefit plans [line items]
Inflation	3.10%	3.20%	3.10%
Ireland
Disclosure of defined benefit plans [line items]
Rate of general increase in salaries	3.70%	3.90%	3.80%
Rate of increase to pensions in payment	2.20%	2.30%	2.20%
Rate of increase to deferred pensions	2.20%	2.40%	2.30%
Discount rate for plan liabilities	3.60%	3.60%	3.20%
Ireland | CPI
Disclosure of defined benefit plans [line items]
Inflation	2.30%	2.50%	2.40%
United States
Disclosure of defined benefit plans [line items]
Rate of general increase in salaries	0.00%	0.00%	0.00%
Rate of increase to pensions in payment	0.00%	0.00%	0.00%
Rate of increase to deferred pensions	0.00%	0.00%	0.00%
Discount rate for plan liabilities	5.30%	4.90%	4.40%
United States | CPI
Disclosure of defined benefit plans [line items]
Inflation	2.30%	2.20%	2.30%

X

- Definition

The expected rate of increases in deferred 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

No definition available.

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- 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
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-IssueDate 2023-01-01
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- Definition

The expected rate of inflation 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
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-Paragraph 144
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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
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-IssueDate 2023-01-01
-Paragraph 144
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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
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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