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Earnings per equity share (Tables)
 12 Months Ended
Mar. 31, 2018
Weighted-average number of shares
     As of March 31,  
     2016      2017      2018  

Weighted average number of equity shares used in computing basic earnings per equity share

      2,517,429,120        2,544,333,609        2,580,538,505  

Effect of potential equity shares for stock options outstanding

      27,938,561        31,017,917        33,400,121  
  

 

 

     

 

 

     

 

 

  

Weighted average number of equity shares used in computing diluted earnings per equity share

      2,545,367,681        2,575,351,526        2,613,938,626  
  

 

 

     

 

 

     

 

 

  
Reconciliation of Earnings Per Share

The following are reconciliations of basic and diluted earnings per equity share and earnings per ADS.

 

     Fiscal years ended March 31,  
     2016      2017      2018      2018  

Basic earnings per share

    Rs. 46.84      Rs. 55.23      Rs. 69.18      US$ 1.06  

Effect of potential equity shares for stock options outstanding

      0.51        0.66        0.89        0.01  
  

 

 

     

 

 

     

 

 

     

 

 

  

Diluted earnings per share

    Rs. 46.33      Rs. 54.57      Rs. 68.29      US$ 1.05  
  

 

 

     

 

 

     

 

 

     

 

 

  

Basic earnings per ADS

    Rs. 140.52      Rs. 165.69      Rs. 207.54      US$ 3.18  

Effect of potential equity shares for stock options outstanding

      1.53        1.98        2.67        0.03  
  

 

 

     

 

 

     

 

 

     

 

 

  

Diluted earnings per ADS

    Rs. 138.99      Rs. 163.71      Rs. 204.87      US$ 3.15