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Commitments and contingencies (Tables)
12 Months Ended
Mar. 31, 2019
Text block [abstract]  
Summary of Contractual Payments under Non-Cancelable Leases


     As at March 31,  
     2018      2019  

Not later than one year

    6,186       7,006  

Later than one year but not later five years

     12,470        11,106  

Later than five years

     2,354        1,629  
  

 

 

    

 

 

 
    21,010       19,741