XML 76 R65.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Bank Overview - Additional Information (Detail) | 12 Months Ended
--- | ---
Mar. 31, 2017
Housing Development Finance Corporation Limited |
Nature Of Business [Line Items] |
Equity ownership interest of the bank's largest shareholder, Housing Development Finance Corporation Limited and its subsidiaries | 21.20%

X
- Definition Nature Of Business [Line Items] + References No definition available. + Details
Name: | hdb_NatureOfBusinessLineItems
Namespace Prefix: | hdb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
Name: | us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=hdb_HousingDevelopmentFinanceCorporationLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |