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Bank Overview - Additional Information (Detail) |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 02, 2018 $ / shares shares | Jul. 17, 2018 ₨ / shares shares | Mar. 31, 2019 ₨ / shares shares | Mar. 31, 2018 shares | Mar. 31, 2017 shares
Employees Stock Option Scheme |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |
Total number of shares issued pursuant to exercise of stock options |  |  | 23,772,304 | 32,544,550 | 34,359,200
Per ADS information (where 1 ADS represents 3 shares) |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |
Shares issued | 17,500,000 |  |  |  |
Shares issued, price per share | $ / shares | $ 104.00 |  |  |  |
Equity Shares |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |
Shares issued | 52,500,000 |  |  |  |
Qualified Institutional Placement (QIP) |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |
Shares issued |  |  | 12,847,222 |  |
Shares issued, price per share | ₨ / shares |  |  | ₨ 2,160.0 |  |
Housing Development Finance Corporation Limited | Preferential Allotment |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |
Shares issued |  | 39,096,817 |  |  |
Shares issued, price per share | ₨ / shares |  | ₨ 2,174.09 |  |  |
Housing Development Finance Corporation Limited |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |
Equity ownership interest of the bank's largest shareholder |  |  | 21.40% | 20.90% |

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