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Summary of Significant Accounting Policies - Additional Information (Detail) ₨ in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2018 INR (₨) | Mar. 31, 2019 INR (₨) Segment | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of minimum tax benefit likely of being realized upon settlement |  |  | 50.00% |  |
Reportable segments | Segment |  |  | 3 |  |
Adoption of accounting standards |  |  | ₨ 0.0 |  |
Equity securities, fair value | [1],[2] |  |  |  | ₨ 559.3
Future minimum lease payments |  |  | ₨ 85,892.8 | $ 1,242.0 |
Financial statements translation rate, Indian rupees (Rs.) equivalence of U.S. $1 |  |  | 69.16 | 69.16 |
ASU 2016-01 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Adoption of accounting standards |  | ₨ 268.0 |  |  |
Cumulative catch-up reclassification from AOCI to retained earnings of an accumulated gross gain |  | 412.0 |  |  |
Equity securities, fair value |  | ₨ 1,267.7 |  |  |
Retail Loans | Personal Loans, Credit Card Receivables, Auto Loans, Commercial Vehicle and Construction Equipment Finance |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Loans charge off period |  |  | 180 days | 180 days |
Retail Loans | Housing loans |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Loans charge off period |  |  | 720 days | 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 | 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 | 1083 days |
[1] | Effective April 1, 2018, the Bank adopted ASU 2016-01 (See note 2(w)(ii) to the Consolidated Financial Statements for additional details).
[2] | Equity securities classified within other assets.

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