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Bank Overview - Additional Information (Detail) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 02, 2018 $ / shares shares | Jul. 17, 2018 ₨ / shares shares | Mar. 31, 2020 ₨ / shares shares | Mar. 31, 2019 ₨ / shares shares | Mar. 31, 2018 shares | Sep. 20, 2019 ₨ / shares shares | Sep. 19, 2019 ₨ / shares
Nature Of Business [Line Items] |  |  |  |  |  |  |
Shares issued, price per share | ₨ / shares |  |  |  |  |  | ₨ 1.0 |
Equity shares, issued |  |  | 5,483,286,460 | 5,446,613,220 |  | 5,470,763,894 |
Equity shares, par value | ₨ / shares |  |  | ₨ 1.0 | ₨ 1.0 |  | ₨ 1.0 | ₨ 2.0
Employees Stock Option Scheme |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |
Total number of shares issued pursuant to exercise of stock options |  |  | 36,673,240 | 47,544,608 | 65,089,100 |  |
Per ADS information (where 1 ADS represents 3 shares) |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |
Shares issued | 35,000,000 |  |  |  |  |  |
Shares issued, price per share | $ / shares | $ 52.00 |  |  |  |  |  |
Equity Shares |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |
Shares issued | 105,000,000 |  |  |  |  |  |
Qualified Institutional Placement (QIP) |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |
Shares issued |  |  | 25,694,444 |  |  |  |
Shares issued, price per share | ₨ / shares |  |  | ₨ 1,080.0 |  |  |  |
Housing Development Finance Corporation Limited |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |
Equity ownership interest of the bank's largest shareholder |  |  | 21.20% | 21.40% |  |  |
Housing Development Finance Corporation Limited | Preferential Allotment |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |
Shares issued |  | 78,193,634 |  |  |  |  |
Shares issued, price per share | ₨ / shares |  | ₨ 1,087.05 |  |  |  |  |

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