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Financial instruments - Fair value and risk management - Change in gross value used for calculating hedge ineffectiveness (Details) - Cash Flow Hedges - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Disclosure of detailed information about hedging instruments [line items]      
Change in gross value used for calculating hedge ineffectiveness € 3,622.4 € (1,020.9) € (541.5)
Foreign currency risk | Property, plant and equipment - aircraft additions      
Disclosure of detailed information about hedging instruments [line items]      
Change in gross value used for calculating hedge ineffectiveness 407.0 (129.8) 356.7
Foreign currency risk | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Change in gross value used for calculating hedge ineffectiveness 405.1 (110.5) 210.6
Foreign currency risk | GBP currency swap      
Disclosure of detailed information about hedging instruments [line items]      
Change in gross value used for calculating hedge ineffectiveness   9.6 (5.4)
Interest rate risk | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Change in gross value used for calculating hedge ineffectiveness 3.8 (1.4) 5.1
Commodity price risk | Fuel and carbon operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Change in gross value used for calculating hedge ineffectiveness € 2,806.5 € (788.8) € (1,108.5)