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Intangible assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Intangible assets      
Balance at beginning of year € 146.4 € 146.4  
Balance at end of year 146.4 146.4 € 146.4
Landing rights      
Intangible assets      
Balance at beginning of year 146.4 146.4 146.4
Acquisition through business combination (note 4) 0.0 0.0 0.0
Balance at end of year 146.4 € 146.4 € 146.4
Impairment of intangible assets € 0.0    
Discounted cash-flow projections period 20 years    
Estimated discount rate applicable 9.00% 11.00% 13.00%