Financial instruments - Fair value and risk management - Gross amounts for hedged items (Details) - EUR (€) € in Millions	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Disclosure of detailed information about hedging instruments [line items]
Total cash flow hedge reserve	€ 31.0	€ 1,295.0	€ 211.0
Gross
Disclosure of detailed information about hedging instruments [line items]
Cash flow hedge reserve, continuing hedges	(79.3)	1,372.5	114.4
Cash flow hedge reserve, balance remaining	83.1	72.6	102.3
Total cash flow hedge reserve	3.8	1,445.1	216.7
Foreign currency risk \| Property, plant and equipment - aircraft additions \| Gross
Disclosure of detailed information about hedging instruments [line items]
Cash flow hedge reserve, continuing hedges	265.6	322.5	139.7
Cash flow hedge reserve, balance remaining	83.1	72.6	102.3
Total cash flow hedge reserve	348.7	395.1	242.0
Foreign currency risk \| Fuel and oil operating expenses \| Gross
Disclosure of detailed information about hedging instruments [line items]
Cash flow hedge reserve, continuing hedges	(38.2)	105.6	(10.6)
Total cash flow hedge reserve	(38.2)	105.6	(10.6)
Foreign currency risk \| GBP currency swap \| Gross
Disclosure of detailed information about hedging instruments [line items]
Cash flow hedge reserve, continuing hedges			5.4
Total cash flow hedge reserve			5.4
Interest rate risk \| Variable-rate instruments \| Gross
Disclosure of detailed information about hedging instruments [line items]
Cash flow hedge reserve, continuing hedges	(6.6)	(4.3)	(6.1)
Total cash flow hedge reserve	(6.6)	(4.3)	(6.1)
Commodity price risk \| Fuel and carbon operating expenses \| Gross
Disclosure of detailed information about hedging instruments [line items]
Cash flow hedge reserve, continuing hedges	(300.1)	948.7	(14.0)
Total cash flow hedge reserve	€ (300.1)	€ 948.7	€ (14.0)

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.

No definition available.

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- Definition

A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 78
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 9
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-Paragraph 6.5.11
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2022-en-r&anchor=para_6.5.11&doctype=Standard
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- Definition

A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 24B
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- Definition

A component of equity representing the reserve of cash flow hedges in relation to hedging relationships for which hedge accounting is no longer applied. [Refer: Reserve of cash flow hedges]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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