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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2018 Segment
Significant Accounting Policies [Line Items] |
Fair values of amortized cost | 95.00%
Percentage of minimum tax benefit likely of being realized upon settlement | 50.00%
Reportable segments | 3
Financial statements translation rate, Indian rupees (Rs.) equivalence of U.S. $1 | 65.11
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%
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%
Maximum | Retail Loans |
Significant Accounting Policies [Line Items] |
Loans charge off period | 1083 days

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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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- Definition Threshold period past due for financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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