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Basis of preparation and material accounting policies (Details)
€ in Millions
 12 Months Ended
Mar. 31, 2025
EUR (€)
aircraft
Mar. 31, 2024
EUR (€)
Mar. 31, 2023
EUR (€)
Mar. 31, 2022
EUR (€)
Disclosure of voluntary change in accounting policy [line items]        
Cash and cash equivalents € 3,863.3 € 3,875.4 € 3,599.3 € 2,669.0
Cash and cash equivalents and cash with a maturity date of longer than three months 4,000.0      
Net cash € 1,303.8 1,372.8 558.8 € (1,451.6)
Number of unencumbered aircrafts | aircraft 586      
Percentage of unencumbered aircrafts 100.00%      
Property, plant and equipment long-lived assets € 10,923.7 10,847.0 9,908.9  
Number of airlines 5      
Retained earnings € 5,588.6 5,899.8 4,180.0  
Repayment of borrowings 50.0 1,100.5 1,039.4  
Cross-currency swaps        
Disclosure of voluntary change in accounting policy [line items]        
Derivatives designated in cash flow hedges, net assets 87.0 144.0    
Commodity derivative instruments associated with fuel and carbon operating expenses        
Disclosure of voluntary change in accounting policy [line items]        
Derivatives designated in cash flow hedges, net assets   27.0    
Derivatives designated in cash flow hedges, net liabilities € 205.0      
Estimated percentage of jet fuel expenses covered by hedging contracts as of reporting date 77.00%      
Hangar and Buildings        
Disclosure of voluntary change in accounting policy [line items]        
Property, plant and equipment long-lived assets € 168.6 155.9 112.1  
Plant and equipment (excluding aircraft)        
Disclosure of voluntary change in accounting policy [line items]        
Property, plant and equipment long-lived assets 68.5 63.0 54.5  
Fixtures and Fittings        
Disclosure of voluntary change in accounting policy [line items]        
Property, plant and equipment long-lived assets 17.2 15.8 10.5  
Motor vehicles        
Disclosure of voluntary change in accounting policy [line items]        
Property, plant and equipment long-lived assets 0.1      
Aircraft        
Disclosure of voluntary change in accounting policy [line items]        
Property, plant and equipment long-lived assets € 10,669.3 € 10,612.3 € 9,731.8  
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