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

X
- Definition Term Placements [Line Items] + References No definition available. + Details
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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
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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