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Provisions - Provision for pension obligation (Details) - Provision for pension obligation - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Disclosure of other provisions [line items]      
Provision for pension obligation at beginning of year € 4.5 € 4.5 € 4.5
Movement during the year
Provision for pension obligation at end of year € 4.5 € 4.5 € 4.5