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Impaired Credit Substitutes (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨) | Mar. 31, 2017 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross impaired credit substitutes | ₨ 0 |  | ₨ 0 | $ 0
Debt securities, other than asset and mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Average impaired credit substitutes | 0 | $ 0 | 0 |
Interest income recognized on impaired credit substitutes | 0 | $ 0 | 0 |
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross impaired credit substitutes | 0 |  | 0 | 0
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes by Industry |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross impaired credit substitutes | ₨ 0 |  | ₨ 0 | $ 0

X
- Definition Average Gross amount during the period of credit substitute securities where cost exceeds fair value is not an other than temporary impairment (OTTI) and which is determined to be temporarily impaired. + References No definition available. + Details
Name: | hdb_AverageImpairedCreditSubstitutes
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Credit Substitutes Impaired Gross Amount where fair value is below cost and the decline is other than temporary. + References No definition available. + Details
Name: | hdb_ImpairedCreditSubstitutes
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of interest income recognized on credit substitute securities classified as impaired during the period. + References No definition available. + Details
Name: | hdb_ImpairedCreditSubstitutesInterestIncomeAccrualMethod
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=hdb_DebtSecuritiesOtherThanAssetAndMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hdb_CreditAgreementAxis=hdb_CreditSubstitutesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hdb_CreditAgreementAxis=hdb_CreditSubstitutesByIndustryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |