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Loan Delinquency and Non-Accrual Loans (Parenthetical) (Detail) - Maximum	12 Months Ended
	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

X

- Definition

Past due period up to which 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

X

- 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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: