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Term Placements - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 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 | ₨ 652.4 | $ 10.1 | ₨ 143.6

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
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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_
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Balance Type: | na
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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