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Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
Income Tax Contingency [Line Items] |  |  |
Opening balance | ₨ 648.3 | $ 10.0 | ₨ 648.3
Increase/(decrease) related to prior year tax positions | 0.0 | 0.0 | 0.0
Closing balance | ₨ 648.3 | $ 10.0 | ₨ 648.3

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- Definition Unrecognized Tax Benefits, Increase Decrease Resulting from Prior Period Tax Positions + References No definition available. + Details
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Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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. + References No definition available. + Details
Name: | us-gaap_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefits
Namespace Prefix: | us-gaap_
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Balance Type: | credit
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