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v3.22.2.2

Employee benefits - Weighted average duration of benefit obligations (Details) | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
U.K. |  |
Disclosure of defined benefit plans [line items] |  |
Weighted average duration of defined benefit obligation | 17 years | 18 years
France |  |
Disclosure of defined benefit plans [line items] |  |
Weighted average duration of defined benefit obligation | 13 years | 15 years
Germany |  |
Disclosure of defined benefit plans [line items] |  |
Weighted average duration of defined benefit obligation | 11 years | 13 years
Other |  |
Disclosure of defined benefit plans [line items] |  |
Weighted average duration of defined benefit obligation | 8 years | 9 years

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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 No definition available. + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_147_c&doctype=Standard -URIDate 2021-03-24 + Details
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