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Income Tax Expense (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨) | Mar. 31, 2019 INR (₨)
Components of Income Tax Expense Benefit Abstract |  |  |  |
Current tax expense | ₨ 122,087.4 | $ 1,669.1 | ₨ 105,587.8 | ₨ 128,050.2
Deferred tax (benefit) expense | (8,267.3) | (112.9) | (101.2) | (8,129.4)
Interest on income tax refund | 0.0 | 0.0 | (6.6) | (527.3)
Income tax expense | ₨ 113,820.1 | $ 1,556.2 | ₨ 105,480.0 | ₨ 119,393.5

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