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Statutory and other information - Shares and share options (Details)
€ in Millions, Options in Millions
12 Months Ended
Mar. 31, 2025
EUR (€)
Options
Mar. 31, 2024
EUR (€)
Options
Mar. 31, 2023
EUR (€)
Options
Mar. 31, 2022
Options
Disclosure of transactions between related parties [line items]        
Number of outstanding share options 16.2 16.6 18.7 22.8
Number of options exercised 0.4 1.4 4.1  
Directors        
Disclosure of transactions between related parties [line items]        
Share based compensation | € € 2.2 € 3.1 € 1.9