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Issued share capital, share premium account and share options - Share options and share purchase arrangements (Details)
Options in Millions, EquityInstruments in Millions
12 Months Ended 96 Months Ended
Mar. 31, 2025
Options
€ / shares
Mar. 31, 2024
Options
€ / shares
Mar. 31, 2023
Options
€ / shares
Mar. 31, 2025
EquityInstruments
Options
€ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share options outstanding at beginning of year | Options 16.6 18.7 22.8  
Share options forfeited | Options   (0.7)    
Share options exercised | Options (0.4) (1.4) (4.1)  
Share options outstanding at end of year | Options 16.2 16.6 18.7 16.2
Weighted average exercise price, share options outstanding at beginning of year | € / shares € 11.18 € 11.24 € 10.57  
Weighted average exercise price, share options forfeited | € / shares   11.12    
Weighted average exercise price, share options exercised | € / shares 11.45 12 7.64  
Weighted average exercise price, share options outstanding at end of year | € / shares € 11.12 € 11.18 € 11.24 € 11.12
LTIP 2019        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of shares granted in share-based payment arrangement | EquityInstruments       1.5
Option plan 2013 | Maximum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Maximum percentage of shares issued under plan in relation to outstanding ordinary shares 5.00%