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Intangible assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2019
Mar. 31, 2020
Intangible assets      
Balance at beginning of year € 146.4    
Balance at end of year 146.4 € 146.4  
Landing rights      
Intangible assets      
Balance at beginning of year 146.4 46.8  
Acquisition through business combination (note 4)   99.6  
Balance at end of year 146.4 € 146.4  
Impairment of intangible assets € 0.0    
Discounted cash-flow projections period 20 years    
Estimated discount rate applicable 11.50% 6.00% 9.00%