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Basis of preparation and significant accounting policies (Details)
€ in Millions, £ in Millions, person in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2021
GBP (£)
Mar. 31, 2021
EUR (€)
Apr. 30, 2020
GBP (£)
Jun. 30, 2023
EUR (€)
aircraft
Sep. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
person
Mar. 31, 2023
EUR (€)
Mar. 31, 2022
EUR (€)
Mar. 31, 2021
EUR (€)
Mar. 31, 2020
EUR (€)
Disclosure of voluntary change in accounting policy [line items]                      
Cash and cash equivalents   € 2,650.7           € 3,599.3 € 2,669.0 € 2,650.7 € 2,566.4
Net cash   (2,276.5)           558.8 (1,451.6) (2,276.5) € (403.2)
Proceeds from borrowings                 1,192.0 [1] 2,228.6  
Property, plant and equipment long-lived assets   8,361.1           € 9,908.9 9,095.1 8,361.1  
Number of airlines               5      
Retained earnings   3,232.3           € 4,180.0 2,880.9 3,232.3  
Payroll Supports Received Through Schemes, COVID-19 Pandemic               0.0 82.0 84.0  
Repayment of borrowings               1,039.4 1,722.3 950.3  
Jet fuel derivative instruments,                      
Disclosure of voluntary change in accounting policy [line items]                      
Net derivative financial assets (liabilities)               (326.0) 1,200.0    
Foreign currency derivative instruments [Member]                      
Disclosure of voluntary change in accounting policy [line items]                      
Net derivative financial assets (liabilities)               261.0 330.0    
Disclosure of liquidity position after end of reporting period                      
Disclosure of voluntary change in accounting policy [line items]                      
Cash and cash equivalents       € 4,840.0              
Net cash       980.0              
Increase in net cash       € 420.0              
Number of unencumbered aircrafts | aircraft       522              
Percentage of unencumbered aircrafts       99.00%              
Forecast                      
Disclosure of voluntary change in accounting policy [line items]                      
Forecasted traffic guests | person             185        
Estimated percentage of jet fuel expenses covered by hedging contracts as of reporting date         14.00% 14.00% 75.00%        
Estimated percentage of jet fuel expenses covered by call options as of reporting date             5.00%        
Increase (decrease) due to changes in accounting policy | Amendment to IFRS 16 - Covid-19 related rent concessions                      
Disclosure of voluntary change in accounting policy [line items]                      
Retained earnings   € 0.0               € 0.0  
HMT and Bank of England Covid Corporate Financing Facility (CCFF)                      
Disclosure of voluntary change in accounting policy [line items]                      
Proceeds from borrowings | £     £ 600                
Interest rate percentage   0.46% 0.44%             0.46%  
Debt extension term   12 months                  
Repayment of borrowings | £ £ 600                    
Hangar and Buildings                      
Disclosure of voluntary change in accounting policy [line items]                      
Property, plant and equipment long-lived assets   € 90.1           112.1 95.6 € 90.1  
Plant and equipment (excluding aircraft)                      
Disclosure of voluntary change in accounting policy [line items]                      
Property, plant and equipment long-lived assets   67.0           54.5 59.7 67.0  
Fixtures and Fittings                      
Disclosure of voluntary change in accounting policy [line items]                      
Property, plant and equipment long-lived assets   10.7           10.5 8.9 10.7  
Motor vehicles                      
Disclosure of voluntary change in accounting policy [line items]                      
Property, plant and equipment long-lived assets   0.4             0.1 0.4  
Aircraft                      
Disclosure of voluntary change in accounting policy [line items]                      
Property, plant and equipment long-lived assets   € 8,192.9           € 9,731.8 € 8,930.8 € 8,192.9  
Residual value as percentage of current market value               15.00%      
Useful life, property, plant and equipment               23 years      
Aircraft | Minimum                      
Disclosure of voluntary change in accounting policy [line items]                      
Interval between maintenance checks               8 years      
Aircraft | Maximum                      
Disclosure of voluntary change in accounting policy [line items]                      
Interval between maintenance checks               12 years      
Boeing 737 Aircraft                      
Disclosure of voluntary change in accounting policy [line items]                      
Residual value as percentage of current market value               15.00%      
Useful life, property, plant and equipment               23 years      
Boeing 737 Aircraft | Minimum                      
Disclosure of voluntary change in accounting policy [line items]                      
Interval between maintenance checks               8 years      
Boeing 737 Aircraft | Maximum                      
Disclosure of voluntary change in accounting policy [line items]                      
Interval between maintenance checks               12 years      
Landing rights                      
Disclosure of voluntary change in accounting policy [line items]                      
Impairment of intangible assets               € 0.0      
[1] €1.2bn bond net of transaction costs.