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Loan Delinquency and Non-Accrual Loans (Parenthetical) (Detail) - Maximum | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of days past due up to which loans considered current | 30 days | 30 days
Number of past days less than to which Crop Related Agricultural loans are not considered as impaired | 366 days | 366 days

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- Definition Past due period up to which crop related agricultural loans considered current. + References No definition available. + Details
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Balance Type: | na
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- Definition Past due period up to which loans other than crop related agricultural loans considered current. + References No definition available. + Details
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Namespace Prefix: | hdb_
Data Type: | xbrli:durationItemType
Balance Type: | na
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |