Financial instruments - Fair values and risk management - Derivative financial instruments - interest rate risk exposure (Details) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of detailed information about financial instruments [line items] | |||
| Borrowings | € 1,491.5 | € 2,682.7 | € 2,746.8 |
| Interest rate risk | |||
| Disclosure of detailed information about financial instruments [line items] | |||
| Percentage of Reasonably Possible Increase in Risk Assumption | 1.00% | ||
| Percentage of Reasonably Possible Decrease in Risk Assumption | 1.00% | ||
| Increase (decrease) in net finance expense (income) due to reasonably possible increase in designated risk | € (24.0) | (3.0) | 42.0 |
| Increase (decrease) in net finance expense (income) due to reasonably possible decrease in designated risk | 32.0 | 53.0 | (16.0) |
| Increase (Decrease) In Equity Due To Reasonably Possible Increase In Designated Risk Component | € 0.0 | € 0.0 | € 0.0 |