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Business Combination - Pro Forma Financial Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2024 INR (₨) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 INR (₨) | Mar. 31, 2023 USD ($)
Business Combinations [Abstract] |  |  |  |
Revenue | ₨ 2,303,956.6 | $ 26,968.9 | ₨ 2,147,961.5 | $ 25,142.9
Net Income | ₨ 645,526.0 | $ 7,556.2 | ₨ 636,783.4 | $ 7,453.9

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