v3.26.1
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, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of detailed information about hedging instruments [line items]      
Reclassified from hedging reserve to profit or loss € (297.7) € 33.5 € (71.2)
Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Change in fair value recognized in OCI 2,427.7 (418.7) 1.5
Reclassified from hedging reserve to profit or loss (297.7) 33.5 (71.2)
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 13.4 (149.8) (515.0)
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 14.4 (114.6) 117.7
Reclassified from hedging reserve to profit or loss (130.4) 110.9 4.2
Interest rate risk | Cash Flow Hedges | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Reclassified from hedging reserve to profit or loss     (3.6)
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 2,399.9 (154.3) 398.8
Reclassified from hedging reserve to profit or loss € (167.3) € (77.4) € (71.8)