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Statutory and other information (Details) - EUR (€)
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of transactions between related parties [line items]      
Audit services € 1,000,000 € 900,000 € 800,000
Audit related assurance services 0 0 0
Other assurance services 300,000 200,000 0
Tax advisory services 100,000 100,000 100,000
Total fees 1,400,000 1,200,000 900,000
Depreciation, property, plant and equipment 1,151,100,000 994,300,000 839,200,000
Parent company      
Disclosure of transactions between related parties [line items]      
Audit services 1,000 1,000 1,000
Outside of Ireland      
Disclosure of transactions between related parties [line items]      
Audit services 0 0 0
Audit related services 0 0 0
Tax advisory services 100,000 100,000 100,000
Total fees 100,000 100,000 100,000
Directors      
Disclosure of transactions between related parties [line items]      
Fees 1,100,000 1,100,000 600,000
Share based compensation 2,200,000 3,100,000 1,900,000
Other emoluments 1,800,000 1,800,000 900,000
Total key management personnel compensation € 5,100,000 € 6,000,000 € 3,400,000