XML 138 R114.htm IDEA: XBRL DOCUMENT v3.25.1
Issued share capital, share premium account and share options - Share capital (Details) - shares
shares in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of classes of share capital [line items]      
Number of shares cancelled during the year 77.0 0.0 0.0
Ordinary shares.      
Disclosure of classes of share capital [line items]      
Increase in number of shares through exercise of share options 1.0 1.4 4.1