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Employee benefits - Principal actuarial assumptions regarding defined benefit plans (Details) - year | Sep. 30, 2023 | Sep. 30, 2022
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U.K. |  |
Disclosure of defined benefit plans [line items] |  |
Discount rate | 5.60% | 4.95%
Future salary increases | 0.33% | 0.35%
Future pension increases | 3.20% | 3.30%
Inflation rate | 3.39% | 3.60%
Longevity at age 65 for current members, Males | 22.0 | 22.0
Longevity at age 65 for current members, Females | 23.8 | 23.8
Longevity at age 45 for current members, Males | 23.4 | 23.3
Longevity at age 45 for current members, Females | 25.3 | 25.3
France |  |
Disclosure of defined benefit plans [line items] |  |
Discount rate | 4.20% | 3.75%
Future salary increases | 4.15% | 3.77%
Future pension increases | 0.00% | 0.00%
Inflation rate | 2.10% | 2.20%
Germany |  |
Disclosure of defined benefit plans [line items] |  |
Discount rate | 4.06% | 4.07%
Future salary increases | 2.50% | 2.50%
Future pension increases | 2.10% | 2.10%
Inflation rate | 2.00% | 2.00%
Longevity at age 65 for current members, Males | 21.0 | 21.0
Longevity at age 65 for current members, Females | 24.0 | 24.0
Longevity at age 45 for current members, Males | 24.0 | 23.0
Longevity at age 45 for current members, Females | 26.0 | 26.0
Other |  |
Disclosure of defined benefit plans [line items] |  |
Discount rate | 5.62% | 5.43%
Future salary increases | 2.76% | 2.64%
Future pension increases | 0.29% | 0.42%
Inflation rate | 3.46% | 3.44%

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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 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + Details
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