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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, 2023 | Jun. 30, 2022 | Jun. 30, 2021
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United Kingdom |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Rate of general increase in salaries | 3.70% | 3.60% | 3.40%
Rate of increase to pensions in payment | 2.90% | 2.90% | 3.10%
Rate of increase to deferred pensions | 2.70% | 2.60% | 2.50%
Discount rate for plan liabilities | 5.20% | 3.80% | 1.90%
United Kingdom | CPI |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Inflation | 2.70% | 2.60% | 2.50%
United Kingdom | RPI |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Inflation | 3.20% | 3.10% | 3.00%
Ireland |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Rate of general increase in salaries | 3.90% | 3.80% | 3.00%
Rate of increase to pensions in payment | 2.30% | 2.20% | 1.70%
Rate of increase to deferred pensions | 2.40% | 2.30% | 1.60%
Discount rate for plan liabilities | 3.60% | 3.20% | 1.00%
Ireland | CPI |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Inflation | 2.50% | 2.40% | 1.60%
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 | 4.90% | 4.40% | 2.70%
United States | CPI |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Inflation | 2.20% | 2.30% | 2.30%

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- 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. + Details
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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 -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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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 -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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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 -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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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 -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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