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Commitments and contingencies (Tables)
12 Months Ended
Mar. 31, 2020
Text block [abstract]  
Summary of Contractual Payments under Non-Cancelable Leases
 
  
As at March

31, 2019
 
Not later than one year
  
7,006
 
Later than one year but not later five years
  
 
11,106
 
Later than five years
  
 
1,629
 
 
  
 
 
 
 
  
19,741