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Statutory and other information - Shares and share options (Details)
€ in Millions, Options in Millions
12 Months Ended
Mar. 31, 2023
EUR (€)
Options
Mar. 31, 2022
EUR (€)
Options
Mar. 31, 2021
EUR (€)
Options
Mar. 31, 2020
Options
Disclosure of transactions between related parties [line items]        
Number of outstanding share options | Options 18.7 22.8 30.0 34.8
Number of options exercised | Options 4.1 6.5 3.6  
Share based compensation | € € 3.7 € 3.7 € 2.4  
Directors        
Disclosure of transactions between related parties [line items]        
Share based compensation | € € 1.9 € 1.9 € 1.9