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Income Taxes - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨)
Income Taxes [Line Items] |  |  |  |  |
Total unrecognized tax benefit | ₨ 43,048.0 | $ 588.6 | ₨ 37,103.2 | $ 507.3 | ₨ 14,448.1
The total unrecognized tax benefits, if recognized, that would reduce the tax and thereby affect the effective tax rate | ₨ 43,048.0 |  | ₨ 37,103.2 |  |
Income tax rate including surcharge and education cess | 25.17% | 25.17% |  |  |
Income tax expense (benefit) recorded in retained earnings | ₨ (21,016.0) |  |  |  |
Other comprehensive income | ₨ (8,457.8) |  |  |  |

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