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Term Placements - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)
Term Placements [Line Items]
Term placements, original maturities, minimum (in months)	3 months
Term placements, original maturities, maximum (in years)	15 years
Term placements, restricted term placements	₨ 331.2	$ 5.1	₨ 652.4

X

- Definition

Amount of term placements subject to withdrawal restrictions, restricted placements held as compensating balances.

+ References

No definition available.

+ Details

Name:	hdb_RestrictedTermPlacements
Namespace Prefix:	hdb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term Placements [Line Items]

+ References

No definition available.

+ Details

Name:	hdb_TermPlacementsLineItems
Namespace Prefix:	hdb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Information by range, including, but not limited to, upper and lower bounds equal to upper limit of the provided range; original maturities of term placements.

+ References

No definition available.

+ Details

Name:	hdb_TermPlacementsMaturityMaximum
Namespace Prefix:	hdb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Information by range, including, but not limited to, upper and lower bounds equal to lower limit of the provided range; original maturities of term placements.

+ References

No definition available.

+ Details

Name:	hdb_TermPlacementsMaturityMinimum
Namespace Prefix:	hdb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration