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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2016 Segment
Significant Accounting Policies [Line Items]
Fair values of amortized cost	95.00%
Reportable segments	3
Financial statements translation rate, Indian rupees (Rs.) equivalence of U.S. $1	66.25
Retail Loans | Personal loans/Credit card
Significant Accounting Policies [Line Items]
Loans charge off period	150 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 to 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	150 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

X

- Definition

Loans Charge Off Description

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Review of impairment of individual investments that have fair value less than 95% of the amortized cost

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Significant Accounting Policies [Line Items]

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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.

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