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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, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of detailed information about hedging instruments [line items]      
Change in gross value used for calculating hedge ineffectiveness € 418.7 € (1.5) € 3,622.4
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 149.8 515.0 407.0
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 114.6 (117.7) 405.1
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
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 € 154.3 € (398.8) € 2,806.5