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Other capital reserve - 2006 Share Plan and 2006 India Share Plan (Details) - 2006 Share Plan and 2006 India Share Plan
12 Months Ended
Mar. 31, 2020
Options
installment
shares
Mar. 31, 2019
Options
shares
Mar. 31, 2018
Options
Vesting Schedule 1      
Share based payments      
Vesting period 60 months    
Vesting Schedule 1, Tranche 1      
Share based payments      
Vesting period 2 years    
Vesting Schedule 2      
Share based payments      
Number of equal monthly vesting installments 12    
Vesting period 12 months    
Vesting Schedule 3, Tranche 1      
Share based payments      
Percentage of shares to vest 50.00%    
Number of equal quarterly vesting installments 16    
Vesting Schedule 3, Tranche 2      
Share based payments      
Percentage of shares to vest 25.00%    
Number of equal quarterly vesting installments 8    
Vesting Schedule 3, Tranche 3      
Share based payments      
Percentage of shares to vest 25.00%    
Number of equal quarterly vesting installments 4    
Options      
Share based payments      
Options outstanding | Options 458,912 652,580 657,130
Ordinary shares      
Share based payments      
Shares reserved for issuance | shares 1,316,765 1,316,765  
Ordinary shares | Options      
Share based payments      
Granted during the year | Options 458,912    
Options outstanding | Options 458,912 652,580