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Other creditors (Details) - aircraft
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of acquired receivables [line items]    
Number of sale and leaseback aircraft returned 12  
Total sale-and-leaseback aircraft 40 26
LaudaMotion    
Disclosure of acquired receivables [line items]    
Number of operating lease arrangements 10