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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, 2017
Mar. 31, 2016
Mar. 31, 2015
Options      
Options outstanding, beginning of period 128,654,300 109,033,000 92,476,600
Granted 0 44,836,200 41,659,000
Exercised (34,359,200) (21,691,200) (22,700,740)
Forfeited (1,992,500) (3,466,800) (2,296,500)
Lapsed (146,300) (56,900) (105,360)
Options outstanding, end of period 92,156,300 128,654,300 109,033,000
Options exercisable, end of period 56,314,000 49,681,000 41,871,400
Weighted Average Exercise Price      
Options outstanding, beginning of period ₨ 840.19 ₨ 683.16 ₨ 556.06
Granted   1,092.65 835.50
Exercised 658.20 563.78 438.50
Forfeited 981.44 900.81 761.32
Lapsed 857.61 546.78 368.42
Options outstanding, end of period 904.97 840.19 683.16
Options exercisable, end of period ₨ 835.06 661.84 537.99
Weighted average fair value of options granted during the year   ₨ 377.69 ₨ 302.31