v3.26.1
Basis of preparation and material accounting policies (Details)
€ in Millions
 12 Months Ended
Mar. 31, 2026
EUR (€)
aircraft
Mar. 31, 2025
EUR (€)
Mar. 31, 2024
EUR (€)
Mar. 31, 2023
EUR (€)
Disclosure of voluntary change in accounting policy [line items]        
Cash and cash equivalents € 2,733.4 € 3,863.3 € 3,875.4 € 3,599.3
Cash and cash equivalents and cash with a maturity date of longer than three months 3,600.0      
Net cash € 2,085.5 1,303.8 1,372.8 € 558.8
Number of unencumbered aircrafts | aircraft 620      
Percentage of unencumbered aircrafts 100.00%      
Property, plant and equipment long-lived assets € 11,373.1 10,923.7 10,847.0  
Number of airlines 5      
Retained earnings € 6,777.5 5,588.6 5,899.8  
Repayment of borrowings 1,190.0 50.0 1,100.5  
Cross-currency swaps        
Disclosure of voluntary change in accounting policy [line items]        
Derivatives designated in cash flow hedges, net assets 49.0 87.0    
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 € 2,028.0      
Derivatives designated in cash flow hedges, net liabilities   205.0    
Estimated percentage of jet fuel expenses covered by hedging contracts as of reporting date 80.00%      
Hangar and Buildings        
Disclosure of voluntary change in accounting policy [line items]        
Property, plant and equipment long-lived assets € 221.8 168.6 155.9  
Plant and equipment (excluding aircraft)        
Disclosure of voluntary change in accounting policy [line items]        
Property, plant and equipment long-lived assets 71.1 68.5 63.0  
Fixtures and Fittings        
Disclosure of voluntary change in accounting policy [line items]        
Property, plant and equipment long-lived assets 14.7 17.2 15.8  
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 € 11,065.5 10,669.3 10,612.3  
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 € 0.0 € 0.0