Financial instruments - Fair value and risk management - Gross amounts for hedged items (Details) - EUR (€) € in Millions	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Disclosure of detailed information about hedging instruments [line items]
Total cash flow hedge reserve	€ 1,295.0	€ 211.0	€ (111.0)
Gross
Disclosure of detailed information about hedging instruments [line items]
Cash flow hedge reserve, continuing hedges	1,372.5	114.4	(211.3)
Cash flow hedge reserve, balance remaining	72.6	102.3	47.8
Total cash flow hedge reserve	1,445.1	216.7	(163.5)
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	322.5	139.7	406.3
Cash flow hedge reserve, balance remaining	72.6	102.3	47.8
Total cash flow hedge reserve	395.1	242.0	454.1
Foreign currency risk \| Fuel and oil operating expenses \| Gross
Disclosure of detailed information about hedging instruments [line items]
Cash flow hedge reserve, continuing hedges	105.6	(10.6)	97.0
Total cash flow hedge reserve	105.6	(10.6)	97.0
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	(4.3)	(6.1)	(2.8)
Total cash flow hedge reserve	(4.3)	(6.1)	(2.8)
Commodity price risk \| Fuel and carbon operating expenses \| Gross
Disclosure of detailed information about hedging instruments [line items]
Cash flow hedge reserve, continuing hedges	948.7	(14.0)	(711.8)
Total cash flow hedge reserve	€ 948.7	€ (14.0)	€ (711.8)

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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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 2021-01-01
-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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