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Financial risk management and derivative financial instruments - Summary of Detailed Information About Hedging Instruments (Detail) € in Millions, £ in Millions, $ in Millions	Dec. 31, 2025 EUR (€) USD ($) GBP (£)	Sep. 30, 2025 EUR (€)
€500m 2.125% bonds 2027
Disclosure of detailed information about hedging instruments [line items]
Interest rate	2.125%
Not categorised as a financial instrument	€ 500
€600m 4.375% bonds 2029
Disclosure of detailed information about hedging instruments [line items]
Interest rate	4.375%
Not categorised as a financial instrument	€ 600
€750m 3.625% bonds 2031
Disclosure of detailed information about hedging instruments [line items]
Interest rate	3.625%
Not categorised as a financial instrument	€ 750
€850m 3.375% bonds 2030
Disclosure of detailed information about hedging instruments [line items]
Interest rate	3.375%
Not categorised as a financial instrument	€ 850	€ 850
November 2018 | Pay leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument | £	436
November 2018 | Pay leg | Interest rate
Disclosure of detailed information about hedging instruments [line items]
Interest rate	3.493%
November 2018 | Receive leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument	500
November 2018 | Receive leg | Interest rate
Disclosure of detailed information about hedging instruments [line items]
Interest rate	2.125%
November 2023 | Pay leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument | $	657
November 2023 | Pay leg | Interest rate
Disclosure of detailed information about hedging instruments [line items]
Interest rate	5.975%
November 2023 | Receive leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument	600
November 2023 | Receive leg | Interest rate
Disclosure of detailed information about hedging instruments [line items]
Interest rate	4.375%
September 2024 | Pay leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument | $	834
September 2024 | Pay leg | Interest rate
Disclosure of detailed information about hedging instruments [line items]
Interest rate	4.903%
September 2024 | Receive leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument	750
September 2024 | Receive leg | Interest rate
Disclosure of detailed information about hedging instruments [line items]
Interest rate	3.625%
September 2025 | Pay leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument | $	990
September 2025 | Pay leg | Interest rate
Disclosure of detailed information about hedging instruments [line items]
Interest rate	4.874%
September 2025 | Receive leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument	850
September 2025 | Receive leg | Interest rate
Disclosure of detailed information about hedging instruments [line items]
Interest rate	3.375%
October 2023 | Pay leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument | $	425
October 2023 | Receive leg
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument | £	344

X

- Definition

The average rate of a hedging instrument. [Refer: Hedging instruments [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 23B
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_23B_b&doctype=Standard
-URIDate 2025-03-27

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X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 7
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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.

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- Definition

The nominal amount of a hedging instrument. [Refer: Hedging instruments [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 7
-IssueDate 2025-01-01
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
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-URIDate 2025-03-27

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+ References

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