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Assets held for sale (Details) - Assets held for sale - Boeing 737 Aircraft
€ in Millions
12 Months Ended
Mar. 31, 2021
EUR (€)
aircraft
Mar. 31, 2020
aircraft
Aug. 31, 2019
aircraft
Assets held for sale      
Aircraft to be sold     10
Aircraft sold 7 3  
Gain on sale of aircraft | € € 13