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Accrued Expenses and Other Liabilities - Additional Information (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2021 INR (₨)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 INR (₨)
Credit card
Other Liabilities [Line Items]
Unamortized annual fees	₨ 1,097.4	$ 15.0	₨ 786.8

X

- Definition

Other Liabilities [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

The carrying amount of deferred costs.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCostsCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	hdb_ProductByTypeAxis=us-gaap_CreditCardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: