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Activity in Options Outstanding under Employee Stock Option Scheme, Employees Stock Option Schemes (Parenthetical) (Detail)	Mar. 31, 2014 shares
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

X

- 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: