Issued share capital, share premium account and share options - Share capital (Details) - shares shares in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of classes of share capital [line items] | |||
| Increase in number of shares through exercise of share options and shares granted in share-based payment arrangements | 0.5 | 1.0 | 1.4 |
| Ordinary shares | |||
| Disclosure of classes of share capital [line items] | |||
| Increase in number of shares through exercise of share options and shares granted in share-based payment arrangements | 0.5 | 1.0 | 1.4 |
| Number of shares cancelled during the year | 21.0 | 77.0 | 0.0 |