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Cash and Cash Equivalents - Additional Information (Detail) - Reserve Bank of India RBI ₨ in Millions, $ in Millions | 12 Months Ended |  |
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Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨)
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Cash and cash equivalents, balance maintained with the RBI to meet the Bank's cash reserve ratio requirement | ₨ 971,381.4 | $ 14,919.1 | ₨ 336,332.8
Cash and cash equivalents, description of cash reserve ratio requirement | The cash reserve ratio has to be maintained on an average basis for a two-week period and should not fall below 95% of the required cash reserve ratio on any particular day. |  |

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