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Income Taxes - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨) | Mar. 31, 2023 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2022 INR (₨)
Income Taxes [Line Items] |  |  |  |  |  |  |
Total unrecognized tax benefit | ₨ 6,717.3 |  | ₨ 22,042.3 | ₨ 48,792.1 | $ 78.6 | $ 258.0 | ₨ 46,774.3
The total unrecognized tax benefits, if recognized, that would reduce the tax and thereby affect the effective tax rate | 6,717.3 |  | 22,042.3 |  | $ 78.6 |  |
Other comprehensive income | ₨ (41,283.1) | $ (483.2) | ₨ (17,828.6) | ₨ 16,980.0 |  |  |

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