The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Classes of financial instruments [domain]]

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

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The minimum undiscounted forecasts period of the Group's operations for assessing the availability of future taxable profits, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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Basis of preparation (Details) - EUR (€) € in Millions	12 Months Ended
Basis of preparation (Details) - EUR (€) € in Millions	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disclosure of Basis Of Preparation [Line Items]
Minimum undiscounted forecast period for assessing future taxable profits	5 years
Threshold forecast period of recovery of tax losses	5 years
Portion of property, plant and equipment in total assets (as a percent)	26.30%	23.90%
Foreign exchange translation differences transferred to the income statement	€ 60	€ 171	€ 272
Operating profit
Disclosure of Basis Of Preparation [Line Items]
Foreign exchange translation differences transferred to the income statement	16	146	110
Financing costs
Disclosure of Basis Of Preparation [Line Items]
Foreign exchange translation differences transferred to the income statement	56	1	173
Income tax expense
Disclosure of Basis Of Preparation [Line Items]
Foreign exchange translation differences transferred to the income statement	€ 20	€ 24	€ 11
Land and buildings \| Minimum [Member]
Disclosure of Basis Of Preparation [Line Items]
Lease term	5 years
Land and buildings \| Top of range [member]
Disclosure of Basis Of Preparation [Line Items]
Lease term	10 years