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Financial instruments - Fair value and risk management - Movements in derivative financial instruments designated as hedging instruments (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of detailed information about hedging instruments [line items]      
Reclassified from hedging reserve to profit or loss € (33.5) € 71.2 € 1,821.6
Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Change in fair value recognized in OCI (418.7) 1.5 (3,622.4)
Reclassified from hedging reserve to profit or loss 33.5 (71.2) 1,821.6
Foreign currency risk | Cash Flow Hedges | Property, plant and equipment - aircraft additions      
Disclosure of detailed information about hedging instruments [line items]      
Change in fair value recognized in OCI (149.8) (515.0) (407.0)
Foreign currency risk | Cash Flow Hedges | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Change in fair value recognized in OCI (114.6) 117.7 (405.1)
Reclassified from hedging reserve to profit or loss 110.9 4.2 261.2
Interest rate risk | Cash Flow Hedges | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Change in fair value recognized in OCI     (3.8)
Reclassified from hedging reserve to profit or loss   (3.6) 2.9
Commodity price risk | Cash Flow Hedges | Fuel and carbon operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Change in fair value recognized in OCI (154.3) 398.8 (2,806.5)
Reclassified from hedging reserve to profit or loss € (77.4) € (71.8) € 1,557.5