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Income Taxes - Additional Information (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
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Income Taxes [Line Items] |  |  |  |  |
Total unrecognized tax benefit | ₨ 37,103.2 | $ 492.1 | ₨ 14,448.1 | $ 191.6 | ₨ 648.3
The total unrecognized tax benefits, if recognized, that would reduce the tax and thereby affect the effective tax rate | ₨ 37,103.2 |  |  |  |
Income tax rate including surcharge and education cess | 25.17% | 25.17% |  |  |

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