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Income Tax Expense (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨) | Mar. 31, 2017 INR (₨)
Components of Income Tax Expense Benefit Abstract |  |  |  |
Current tax expense | ₨ 128,050.2 | $ 1,851.5 | ₨ 108,676.0 | ₨ 84,273.5
Deferred tax (benefit) expense | (8,129.4) | (117.6) | (10,403.5) | (5,048.6)
Interest on income tax refund | (527.3) | (7.6) | 0.0 | 0.0
Income tax expense | ₨ 119,393.5 | $ 1,726.3 | ₨ 98,272.5 | ₨ 79,224.9

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