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Provisions - Provision for aircraft maintenance on leased aircraft (Details)
€ in Millions
12 Months Ended
Mar. 31, 2025
EUR (€)
aircraft
Mar. 31, 2024
EUR (€)
aircraft
Mar. 31, 2023
EUR (€)
aircraft
Provision for aircraft maintenance on leased aircraft      
Disclosure of other provisions [line items]      
Other provisions at beginning of year € 184.1 € 169.8 € 98.8
Increase in provision during the year 18.5 27.5 71.0
Utilization of provision upon the hand-back of aircraft (8.0) (13.2)  
Other provisions at end of year € 194.6 € 184.1 € 169.8
Airbus A320      
Disclosure of other provisions [line items]      
Number of leased aircraft returned to lessor | aircraft 1 2 1