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Commitments and contingencies - Finance leases (Details)
€ in Millions
12 Months Ended 109 Months Ended
Mar. 31, 2021
EUR (€)
aircraft
Mar. 31, 2014
aircraft
Mar. 31, 2023
EUR (€)
aircraft
Mar. 31, 2022
EUR (€)
Mar. 31, 2020
EUR (€)
Operating and Finance leases          
Number of aircraft leased     29    
Lease liability | € € 183.1   € 206.3 € 138.3 € 245.9
Japanese Operating Leases with Call Options Arrangement | Boeing 737NG aircraft          
Operating and Finance leases          
Number of aircraft accounted for as finance leases   30      
Period of euro denominated Japanese operating lease with call options   13 years      
Number of aircraft purchased through exercise of options 10