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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 INR (₨) Segment | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨) | [1]
Significant Accounting Policies [Line Items] |  |  |
Fair values of amortized cost | 95.00% | 95.00% |
Reportable segments | Segment | 3 |  |
Debt issuance cost | ₨ 68,300,000 | $ 1.1 | ₨ 0
Financial statements translation rate, Indian rupees (Rs.) equivalence of U.S. $1 | ₨ | 64.85 |  |
ASU 2015-03 and ASU 2015-15 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Debt issuance cost | ₨ 68,300,000 | $ 1.1 |
Retail Loans | Personal loans/Credit card |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period | 180 days |  |
Retail Loans | Auto Loans, Commercial Vehicle and Construction Equipment Finance |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period | 180 days |  |
Retail Loans | Housing loans |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period | 720 days |  |
Retail Loans | Retail Business Banking |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period | Customer by customer basis |  |
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Bank voting rights | 20.00% | 20.00% |
Minimum | Retail Loans |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period | 180 days |  |
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Bank voting rights | 50.00% | 50.00% |
Maximum | Retail Loans |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period | 1083 days |  |
[1] | The Bank has adopted the provisions of ASU 2015-03- "Interest-Imputation of Interest (subtopic 835-30)", prospectively. Refer to note 2(w)

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