v3.26.1
Statutory and other information (Details) - EUR (€)
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of transactions between related parties [line items]      
Audit services € 1,000,000 € 1,000,000 € 900,000
Audit related assurance services 0 0 0
Other assurance services 300,000 300,000 200,000
Tax advisory services 100,000 100,000 100,000
Total fees 1,400,000 1,400,000 1,200,000
Depreciation, property, plant and equipment 1,311,500,000 1,151,100,000 994,300,000
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 1,000,000 1,100,000 1,100,000
Share based compensation 2,300,000 2,200,000 3,100,000
Other emoluments 1,800,000 1,800,000 1,800,000
Total key management personnel compensation € 5,100,000 € 5,100,000 € 6,000,000