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Reconciliation of Estimated Income Taxes at Indian Statutory Income Tax Rate to Income Tax Expense as Reported (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2016
INR (₨)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
INR (₨)
Mar. 31, 2014
INR (₨)
Reconciliation of Estimated Income Taxes to Income Tax Expense as Reported [Line Items]        
Income before income tax expense ₨ 185,586.8 $ 2,801.3 ₨ 154,024.6 ₨ 121,750.4
Statutory income tax rate 34.61% 34.61% 33.99% 33.99%
Expected income tax expense ₨ 64,227.9 $ 969.5 ₨ 52,353.0 ₨ 41,383.0
Adjustments to reconcile expected income tax to actual tax expense        
Interest on income tax refund, net of tax effect 0.0 0.0 (54.4) (16.8)
Nondeductible stock-based compensation 4,358.5 65.8 3,106.3 1,867.9
Income exempt from taxes (1,140.5) (17.2) (1,026.6) (450.9)
Effect of change in statutory tax rate (274.3) (4.1) 0.0 (606.6)
Other, net 365.3 5.4 141.6 127.6
Income tax expense ₨ 67,536.9 $ 1,019.4 ₨ 54,519.9 ₨ 42,304.2