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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]
Mar. 31, 2019
INR (₨)
mo
Mar. 31, 2018
INR (₨)
mo
Mar. 31, 2017
INR (₨)
mo
Exercise Price Rs. 480.20 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of outstanding share options     20,181
Weighted average exercise price ₨ 480.20 ₨ 480.20 ₨ 480.20
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 17,607,463 13,543,997 7,952,083
Weighted average remaining life (Months) | mo 24 27 19
Weighted average exercise price ₨ 2.00 ₨ 2.00 ₨ 2.00
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 14,446,790 10,199,054 5,288,783
Weighted average remaining life (Months) | mo 26 28 24
Weighted average exercise price ₨ 0.03 ₨ 0.03 ₨ 0.03