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Fair Values of 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] |  |  |  |
Pass | ₨ 419,540.6 |  | ₨ 297,241.0 | $ 6,469.4
Impaired-gross balance | 0.0 |  | 0.0 | 0.0
Less: amounts provided for other than temporary impairments | 0.0 | $ 0.0 | 0.0 |
Impaired credit substitutes, net | 0.0 |  | 0.0 | 0.0
Total credit substitutes, net | ₨ 419,540.6 |  | ₨ 297,241.0 | $ 6,469.4

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- Definition This item represents the aggregate fair value of investments in Available for Sale Credit Substitute. + References No definition available. + Details
Name: | hdb_AvailableforsaleCreditSubstituteSecurities
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Credit Substitutes Performing in which payments are received or paid on a timely basis in accordance with the terms of the contract. + References No definition available. + Details
Name: | hdb_CreditSubstitutesPerforming
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 Credit Substitutes, net, after provision made towards other than temporary impairments. + References No definition available. + Details
Name: | hdb_ImpairedCreditSubstitutesNet
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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