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Other capital reserve - Restricted Stock Unit Plan (Details) - Restricted Stock Unit Plan
12 Months Ended
Dec. 16, 2016
INR (₨)
shares
Mar. 31, 2020
INR (₨)
EquityInstruments
Mar. 31, 2019
INR (₨)
EquityInstruments
installment
Mar. 31, 2018
INR (₨)
EquityInstruments
RSUs        
Number of shares        
Share based compensation cost | ₨   ₨ 103,110,000 ₨ 633,172,000
Business combinations        
Share based payments        
Issue of treasury shares | shares 74,458      
Business combinations | Ordinary shares        
Share based payments        
Number of shares into which each RSU may be converted | shares 1      
Business combinations | RSUs        
Share based payments        
Vesting period 2 years      
Repurchase period 2 years      
Number of shares        
Number of RSU's outstanding at the beginning of the year       719,575
Granted during the year | ₨ 2,000,000      
Forfeited during the year     372  
Expired during the year     738  
Vested during the year     718,465  
Vested/exercisable and not exercised   643,147 643,147  
Business combinations | RSUs | Modified Vesting        
Number of shares        
Number of RSU's outstanding at the beginning of the year       1,925,542
Business combinations | RSUs | Vesting schedule 1        
Number of shares        
Percentage of shares to vest     25.00%  
Business combinations | RSUs | Vesting schedule 2        
Number of shares        
Percentage of shares to vest     75.00%  
Number of equal quarterly vesting installments | installment     6