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Financial instruments - Fair values and risk management - Fair value transfers (Details)
€ in Millions
12 Months Ended
Mar. 31, 2025
EUR (€)
Financial instruments - Fair values and risk management  
Transfer from level 1 to level 2 (assets) € 0.0
Transfer from level 2 to level 1 (assets) 0.0
Transfer from level 1 to level 2 (liabilities) 0.0
Transfer from level 2 to level 1 (liabilities) 0.0
Transfer into Level 3 (assets) 0.0
Transfer out of Level3 (assets) 0.0
Transfer into Level 3 (liabilities) 0.0
Transfer out of Level3 (liabilities) € 0.0