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Statutory and other information (Details) - EUR (€)
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Disclosure of transactions between related parties [line items]      
Share based compensation € 3,700,000 € 3,700,000 € 2,400,000
Total Directors' emoluments 11,800,000 11,300,000 6,600,000
Audit fees 800,000 600,000 600,000
Audit related fees   100,000 100,000
Tax advisory fees 100,000   100,000
Total fees 900,000 700,000 800,000
Depreciation, property, plant and equipment 839,200,000 664,800,000 502,400,000
Depreciation of property, plant and equipment held under leases     5,900,000
Lease charges, principally for aircraft     6,700,000
Parent company      
Disclosure of transactions between related parties [line items]      
Audit fees 1,000 1,000 1,000
Outside of Ireland      
Disclosure of transactions between related parties [line items]      
Audit fees   100,000 100,000
Tax advisory fees 100,000    
Total fees 100,000 100,000 100,000
Directors      
Disclosure of transactions between related parties [line items]      
Fees 600,000 600,000 500,000
Share based compensation 1,900,000 1,900,000 1,900,000
Other emoluments 900,000 1,000,000.0 300,000
Total Directors' emoluments € 3,400,000 € 3,500,000 € 2,700,000