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Loans - Summary Information Relating to Non-performing Loans (Detail) Loans (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨) | Mar. 31, 2023 INR (₨)
Gross Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income recognized on non-performing loans | ₨ 10,884.1 | $ 127.4 | ₨ 9,675.9 | ₨ 7,738.0

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