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Investments in Affiliates (Detail) - Softcell Technologies Limited (''Softcell'') ₨ in Millions	12 Months Ended
	Mar. 31, 2019 INR (₨)
Investments in and Advances to Affiliates [Line Items]
Type of Business	Business-to-business software services
HDFC Bank Limited and subsidiaries Investment	₨ 30.3
HDFC Bank Limited and Subsidiaries Ownership	14.00%
HDFC Group Ownership
Investments in and Advances to Affiliates [Line Items]
HDFC Bank Limited and Subsidiaries Ownership	26.00%

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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Amount of investment in equity method investee and investment in and advance to affiliate.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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