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Activity in Options Outstanding under Employee Stock Option Scheme, Employees Stock Option Schemes (Detail) - Employees Stock Option Scheme - ₨ / shares
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Options      
Options outstanding, beginning of period 92,156,300 128,654,300 109,033,000
Granted 16,882,050 0 44,836,200
Exercised (32,544,550) (34,359,200) (21,691,200)
Forfeited (986,800) (1,992,500) (3,466,800)
Lapsed (63,200) (146,300) (56,900)
Options outstanding, end of period 75,443,800 92,156,300 128,654,300
Options exercisable, end of period 46,810,250 56,314,000 49,681,000
Weighted Average Exercise Price      
Options outstanding, beginning of period ₨ 904.97 ₨ 840.19 ₨ 683.16
Granted 1,433.23 0.00 1,092.65
Exercised 837.59 658.20 563.78
Forfeited 1,055.59 981.44 900.81
Lapsed 963.45 857.61 546.78
Options outstanding, end of period 1,050.22 904.97 840.19
Options exercisable, end of period 901.44 835.06 661.84
Weighted average fair value of options granted during the year ₨ 464.17 ₨ 0.00 ₨ 377.69