v3.26.1
Issued share capital, share premium account and share options - Range of exercise price (Details)
€ / shares in Units, € in Millions, Options in Millions
12 Months Ended
Mar. 31, 2026
EUR (€)
Options
€ / shares
Mar. 31, 2025
EUR (€)
Options
€ / shares
Mar. 31, 2024
EUR (€)
Options
€ / shares
Mar. 31, 2023
Options
€ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Weighted-average exercise price | € / shares € 11.12 € 11.12 € 11.18 € 11.24
Number of options outstanding | Options 15.9 16.2 16.6 18.7
Weighted average remaining contractual life 1 year 10 months 24 days      
Share based payments | € € 15.0 € 12.8 € (3.9)  
Share-based payment arrangements, service period for option plan 5 years      
LTIP 2019        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Share-based payment arrangements, service period for share award plan 3 years      
Exercise price of 11.12 | Unvested share options        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Exercise price | € / shares € 11.12      
Number of options outstanding | Options 15.9      
Weighted average remaining contractual life 1 year 10 months 24 days