Investments in Affiliates (Detail) ₨ in Millions	12 Months Ended
Mar. 31, 2017 INR (₨)
Computer Age Management Services Private Limited (''CAMS'')
Investments in and Advances to Affiliates [Line Items]
Type of Business	Unit capital accounting and transfer agency services
HDFC Bank Ltd. and subsidiaries Investment	₨ 9.8
Investments in affiliates	12.10%
Softcell Technologies Limited (''Softcell'')
Investments in and Advances to Affiliates [Line Items]
Type of Business	Business-to-business software services
HDFC Bank Ltd. and subsidiaries Investment	₨ 30.3
Investments in affiliates	14.00%
International Asset Reconstruction Company Private Limited
Investments in and Advances to Affiliates [Line Items]
Type of Business	Business of securitization and asset reconstruction
HDFC Bank Ltd. and subsidiaries Investment	₨ 311.7
Investments in affiliates	29.40%
HDFC Group Ownership \| Computer Age Management Services Private Limited (''CAMS'')
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	23.20%
HDFC Group Ownership \| Softcell Technologies Limited (''Softcell'')
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	26.00%
HDFC Group Ownership \| International Asset Reconstruction Company Private Limited
Investments in and Advances to Affiliates [Line Items]
Investments in affiliates	29.40%

A description of the principal activities of an investee accounted for under the equity method.

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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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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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