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Financial instruments - Fair values and risk management - Sensitivity analysis (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Interest rate risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible increase in risk assumption 1.00%    
Percentage of reasonably possible decrease in risk assumption 1.00%    
Changes in equity due to decrease in risk component € 0.0 € 0.0 € 0.0
Foreign currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of Reasonably Possible Increase (decrease) in Risk Assumption 10.00%    
Percentage of reasonably possible increase in risk assumption 10.00%    
Percentage of reasonably possible decrease in risk assumption 10.00%    
Changes in profit loss due to increase in risk component € (2.0) (33.0) (235.0)
Changes in profit loss due to decrease in risk component 26.0 40.0 246.0
Changes in equity due to increase in risk component (588.0) (372.0) (531.0)
Changes in equity due to decrease in risk component € 695.0 304.0 € 649.0
Jet fuel risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of Reasonably Possible Increase (decrease) in Risk Assumption 10.00%    
Percentage of reasonably possible increase in risk assumption 10.00%    
Percentage of reasonably possible decrease in risk assumption 10.00%    
Changes in profit loss due to increase in risk component € 47.0 4.0  
Changes in profit loss due to decrease in risk component (40.0) (4.0)  
Changes in equity due to increase in risk component 234.0 65.0  
Changes in equity due to decrease in risk component € (234.0) € (65.0)