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Statutory and other information - Accumulated accrued benefits (Details) - EUR (€)
€ in Millions
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of transactions between related parties [line items]      
Accumulated accrued benefits € 3.9 € 4.1 € 4.1
Michael O'Leary      
Disclosure of transactions between related parties [line items]      
Accumulated accrued benefits € 0.1 € 0.1 € 0.1