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Activity in Options Outstanding under Employee Stock Option Scheme, Employees Stock Option Schemes (Parenthetical) (Detail) | Mar. 31, 2014 shares
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Employees Stock Option Scheme |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options exercised previous period allotted | 728,290

X
- Definition Number of share options (or share units) exercised during the previous period allotted during current period. + References No definition available. + Details
Name: | hdb_StockExercisedDuringPreviousPeriodSharesStockOptionsAllotted
Namespace Prefix: | hdb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |