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Loans - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨) | Mar. 31, 2025 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans provided as collateral for borrowings | ₨ 2,750,841.6 |  | ₨ 2,288,842.6 | $ 32,199.9
Purchased financing receivable outstanding | 1,691.8 | $ 19.8 | 2,600.7 |
Loans receivable restructured due to unexpected event | 45,700.0 |  | 72,900.0 | $ 500.0
Retail Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable restructured due to unexpected event | 68,600.0 |  | 42,900.0 |
Wholesale Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable restructured due to unexpected event | ₨ 4,300.0 |  | ₨ 2,800.0 |
Current Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of days past due up to which loans | 90 days |  |  | 90 days
Crop related agricultural loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of days past due up to which loans | 366 days |  |  | 366 days

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