XML 120 R154.htm IDEA: XBRL DOCUMENT v3.20.1
Employee Stock Incentive Plans - Schedule of general terms of grants under stock option plans and restricted stock unit option plans (Detail) - Employee stock option plans and restricted stock unit option [member]
12 Months Ended
Mar. 31, 2020
₨ / shares
Mar. 31, 2019
₨ / shares
Mar. 31, 2018
₨ / shares
Mar. 31, 2020
$ / shares
Mar. 31, 2019
$ / shares
Mar. 31, 2018
$ / shares
Exercise Price Rs. 2 [Member]            
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]            
Number of outstanding share options 15,594,190 17,607,463 13,543,997 15,594,190 17,607,463 13,543,997
Weighted average remaining life (Months) 23 months 24 months 27 months      
Weighted average exercise price | ₨ / shares ₨ 2 ₨ 2 ₨ 2      
Exercise Price US $ 0.03 [Member]            
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]            
Number of outstanding share options 7,854,540 14,446,790 10,199,054 7,854,540 14,446,790 10,199,054
Weighted average remaining life (Months) 23 months 26 months 28 months      
Weighted average exercise price | $ / shares       $ 0.03 $ 0.03 $ 0.03