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Statutory and other information - Accumulated accrued benefits (Details)
€ in Millions
36 Months Ended
Mar. 31, 2025
EUR (€)
individual
Mar. 31, 2024
EUR (€)
Mar. 31, 2023
EUR (€)
Michael O'Leary      
Disclosure of transactions between related parties [line items]      
Accumulated accrued benefits | € € 0.1 € 0.1 € 0.1
Non-executive directors      
Disclosure of transactions between related parties [line items]      
Number of individuals receiving pension contributions during the period | individual 0