v3.26.1
Financial instruments - Fair value and risk management - Gross amounts for hedged items (Details) - EUR (€)
€ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of detailed information about hedging instruments [line items]      
Total cash flow hedge reserve € (1,830.0) € 21.0 € (266.0)
Gross      
Disclosure of detailed information about hedging instruments [line items]      
Continuing hedges (2,083.8) 112.5 (140.5)
Balance remaining   (76.1) (142.6)
Total cash flow hedge reserve (2,083.8) 36.4 (283.1)
Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Deferred tax included in hedge reserve 253.0 (15.0) 17.0
Foreign currency risk | Property, plant and equipment - aircraft additions | Gross      
Disclosure of detailed information about hedging instruments [line items]      
Continuing hedges (84.8) (7.7) (30.0)
Balance remaining   (76.1) (142.6)
Total cash flow hedge reserve (84.8) (83.8) (172.6)
Foreign currency risk | Fuel and oil operating expenses | Gross      
Disclosure of detailed information about hedging instruments [line items]      
Continuing hedges 28.6 (84.7) (83.7)
Total cash flow hedge reserve 28.6 (84.7) (83.7)
Commodity price risk | Fuel and carbon operating expenses | Gross      
Disclosure of detailed information about hedging instruments [line items]      
Continuing hedges (2,027.6) 204.9 (26.8)
Total cash flow hedge reserve € (2,027.6) € 204.9 € (26.8)