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Provisions - Provision for aircraft maintenance on leased aircraft (Details)
€ in Millions
12 Months Ended
Mar. 31, 2023
EUR (€)
aircraft
Mar. 31, 2022
EUR (€)
aircraft
Mar. 31, 2021
EUR (€)
aircraft
Provision for aircraft maintenance on leased aircraft      
Disclosure of other provisions [line items]      
Other provisions at beginning of year € 98.8 € 53.2 € 75.4
Increase in provision during the year 71.0 55.6 37.3
Utilization of provision upon the hand-back of aircraft   (10.0) (59.5)
Other provisions at end of year € 169.8 € 98.8 € 53.2
Airbus A320      
Disclosure of other provisions [line items]      
Number of leased aircraft returned to lessor | aircraft 1    
Boeing 737 Aircraft      
Disclosure of other provisions [line items]      
Number of leased aircraft returned to lessor | aircraft   3 11